diff --git a/package-lock.json b/package-lock.json
index 71b3cc0d2e5..38d7d9146b8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -118,13 +118,13 @@
       "integrity": "sha512-Es6WcD0nO5l+2BOQS4uLfNPYQaNDfbot3X1XUoloz+x0mPDS3eeORZJl06HXjwBG1fOGwCRnzK88LMdxKRrd6Q=="
     },
     "@plotly/d3-sankey": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/@plotly/d3-sankey/-/d3-sankey-0.5.1.tgz",
-      "integrity": "sha512-uMToNGexOSLG0hBm+uAzElfFW0Pt2utgJ//puL5nuerNnPnRTTe3Un7XFVcWqRhvXEViF00Xq/8wGoA8i8eZJA==",
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/@plotly/d3-sankey/-/d3-sankey-0.7.2.tgz",
+      "integrity": "sha512-2jdVos1N3mMp3QW0k2q1ph7Gd6j5PY1YihBrwpkFnKqO+cqtZq3AdEYUeSGXMeLsBDQYiqTVcihYfk8vr5tqhw==",
       "requires": {
         "d3-array": "1",
         "d3-collection": "1",
-        "d3-interpolate": "1"
+        "d3-shape": "^1.2.0"
       }
     },
     "@types/bluebird": {
@@ -2327,11 +2327,35 @@
         "d3-color": "1"
       }
     },
+    "d3-path": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/d3-path/-/d3-path-1.0.7.tgz",
+      "integrity": "sha512-q0cW1RpvA5c5ma2rch62mX8AYaiLX0+bdaSM2wxSU9tXjU4DNvkx9qiUvjkuWCj3p22UO/hlPivujqMiR9PDzA=="
+    },
     "d3-quadtree": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/d3-quadtree/-/d3-quadtree-1.0.3.tgz",
       "integrity": "sha1-rHmH4+I/6AWpkPKOG1DTj8uCJDg="
     },
+    "d3-sankey-circular": {
+      "version": "0.32.0",
+      "resolved": "https://registry.npmjs.org/d3-sankey-circular/-/d3-sankey-circular-0.32.0.tgz",
+      "integrity": "sha512-lZvF25xPFNzsHkI4VPAxRVH+U6iZnWKswknOmXd5jl88obWZ7iJJG/nhE49B0+I6ZDsUB78ggsMmSR3S5m9+Sg==",
+      "requires": {
+        "d3-array": "^1.2.1",
+        "d3-collection": "^1.0.4",
+        "d3-shape": "^1.2.0",
+        "elementary-circuits-directed-graph": "^1.0.4"
+      }
+    },
+    "d3-shape": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/d3-shape/-/d3-shape-1.2.2.tgz",
+      "integrity": "sha512-hUGEozlKecFZ2bOSNt7ENex+4Tk9uc/m0TtTEHBvitCBxUNjhzm5hS2GrrVRD/ae4IylSmxGeqX5tWC2rASMlQ==",
+      "requires": {
+        "d3-path": "1"
+      }
+    },
     "d3-timer": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/d3-timer/-/d3-timer-1.0.7.tgz",
@@ -3023,6 +3047,14 @@
       "resolved": "https://registry.npmjs.org/element-size/-/element-size-1.1.1.tgz",
       "integrity": "sha1-ZOXxWdlxIWMYRby67K8nnDm1404="
     },
+    "elementary-circuits-directed-graph": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/elementary-circuits-directed-graph/-/elementary-circuits-directed-graph-1.0.4.tgz",
+      "integrity": "sha512-+xpVxSimU+fcHiTRPWrRN1IFOKaygwotCtZGSBle/rnFaFAoI+4Y8/pimAY1cKiDIHTek2Zox1R7SEQAB/AQ1g==",
+      "requires": {
+        "strongly-connected-components": "^1.0.1"
+      }
+    },
     "elliptic": {
       "version": "6.4.1",
       "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.4.1.tgz",
diff --git a/package.json b/package.json
index 3d102c33e99..d975860f75f 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,6 @@
   },
   "dependencies": {
     "3d-view": "^2.0.0",
-    "@plotly/d3-sankey": "^0.5.1",
     "alpha-shape": "^1.0.0",
     "array-range": "^1.0.1",
     "canvas-fit": "^1.5.0",
@@ -66,7 +65,10 @@
     "convex-hull": "^1.0.3",
     "country-regex": "^1.1.0",
     "d3": "^3.5.12",
+    "@plotly/d3-sankey": "0.7.2",
+    "d3-sankey-circular": "0.32.0",
     "d3-force": "^1.0.6",
+    "d3-interpolate": "1",
     "delaunay-triangulate": "^1.1.6",
     "es6-promise": "^3.0.2",
     "fast-isnumeric": "^1.1.2",
diff --git a/src/traces/sankey/calc.js b/src/traces/sankey/calc.js
index 161799b5817..8e9a5756517 100644
--- a/src/traces/sankey/calc.js
+++ b/src/traces/sankey/calc.js
@@ -12,6 +12,77 @@ var tarjan = require('strongly-connected-components');
 var Lib = require('../../lib');
 var wrap = require('../../lib/gup').wrap;
 
+var isArrayOrTypedArray = Lib.isArrayOrTypedArray;
+var isIndex = Lib.isIndex;
+
+
+function convertToD3Sankey(trace) {
+    var nodeSpec = trace.node;
+    var linkSpec = trace.link;
+
+    var links = [];
+    var hasLinkColorArray = isArrayOrTypedArray(linkSpec.color);
+    var linkedNodes = {};
+
+    var nodeCount = nodeSpec.label.length;
+    var i;
+    for(i = 0; i < linkSpec.value.length; i++) {
+        var val = linkSpec.value[i];
+        // remove negative values, but keep zeros with special treatment
+        var source = linkSpec.source[i];
+        var target = linkSpec.target[i];
+        if(!(val > 0 && isIndex(source, nodeCount) && isIndex(target, nodeCount))) {
+            continue;
+        }
+
+        source = +source;
+        target = +target;
+        linkedNodes[source] = linkedNodes[target] = true;
+
+        var label = '';
+        if(linkSpec.label && linkSpec.label[i]) label = linkSpec.label[i];
+
+        links.push({
+            pointNumber: i,
+            label: label,
+            color: hasLinkColorArray ? linkSpec.color[i] : linkSpec.color,
+            source: source,
+            target: target,
+            value: +val
+        });
+    }
+
+    var hasNodeColorArray = isArrayOrTypedArray(nodeSpec.color);
+    var nodes = [];
+    var removedNodes = false;
+    var nodeIndices = {};
+
+    for(i = 0; i < nodeCount; i++) {
+        if(linkedNodes[i]) {
+            var l = nodeSpec.label[i];
+            nodeIndices[i] = nodes.length;
+            nodes.push({
+                pointNumber: i,
+                label: l,
+                color: hasNodeColorArray ? nodeSpec.color[i] : nodeSpec.color
+            });
+        } else removedNodes = true;
+    }
+
+    // need to re-index links now, since we didn't put all the nodes in
+    if(removedNodes) {
+        for(i = 0; i < links.length; i++) {
+            links[i].source = nodeIndices[links[i].source];
+            links[i].target = nodeIndices[links[i].target];
+        }
+    }
+
+    return {
+        links: links,
+        nodes: nodes
+    };
+}
+
 function circularityPresent(nodeList, sources, targets) {
 
     var nodeLen = nodeList.length;
@@ -36,20 +107,16 @@ function circularityPresent(nodeList, sources, targets) {
 }
 
 module.exports = function calc(gd, trace) {
-
+    var circular = false;
     if(circularityPresent(trace.node.label, trace.link.source, trace.link.target)) {
-        Lib.error('Circularity is present in the Sankey data. Removing all nodes and links.');
-        trace.link.label = [];
-        trace.link.source = [];
-        trace.link.target = [];
-        trace.link.value = [];
-        trace.link.color = [];
-        trace.node.label = [];
-        trace.node.color = [];
+        circular = true;
     }
 
+    var result = convertToD3Sankey(trace);
+
     return wrap({
-        link: trace.link,
-        node: trace.node
+        circular: circular,
+        _nodes: result.nodes,
+        _links: result.links
     });
 };
diff --git a/src/traces/sankey/plot.js b/src/traces/sankey/plot.js
index 65611bf7b82..cc04eb441ed 100644
--- a/src/traces/sankey/plot.js
+++ b/src/traces/sankey/plot.js
@@ -94,7 +94,6 @@ function linkNonHoveredStyle(d, sankey, visitNodes, sankeyLink) {
     var label = sankeyLink.datum().link.label;
 
     sankeyLink.style('fill-opacity', function(d) {return d.tinyColorAlpha;});
-
     if(label) {
         ownTrace(sankey, d)
             .selectAll('.' + cn.sankeyLink)
@@ -152,16 +151,23 @@ module.exports = function plot(gd, calcData) {
         var obj = d.link.trace.link;
         if(obj.hoverinfo === 'none' || obj.hoverinfo === 'skip') return;
         var rootBBox = gd._fullLayout._paperdiv.node().getBoundingClientRect();
-        var boundingBox = element.getBoundingClientRect();
-        var hoverCenterX = boundingBox.left + boundingBox.width / 2;
-        var hoverCenterY = boundingBox.top + boundingBox.height / 2;
+        var hoverCenterX;
+        var hoverCenterY;
+        if(d.link.circular) {
+            hoverCenterX = (d.link.circularPathData.leftInnerExtent + d.link.circularPathData.rightInnerExtent) / 2 + d.parent.translateX;
+            hoverCenterY = d.link.circularPathData.verticalFullExtent + d.parent.translateY;
+        } else {
+            var boundingBox = element.getBoundingClientRect();
+            hoverCenterX = boundingBox.left + boundingBox.width / 2 - rootBBox.left;
+            hoverCenterY = boundingBox.top + boundingBox.height / 2 - rootBBox.top;
+        }
 
         var hovertemplateLabels = {valueLabel: d3.format(d.valueFormat)(d.link.value) + d.valueSuffix};
         d.link.fullData = d.link.trace;
 
         var tooltip = Fx.loneHover({
-            x: hoverCenterX - rootBBox.left,
-            y: hoverCenterY - rootBBox.top,
+            x: hoverCenterX,
+            y: hoverCenterY,
             name: hovertemplateLabels.valueLabel,
             text: [
                 d.link.label || '',
diff --git a/src/traces/sankey/render.js b/src/traces/sankey/render.js
index c80f84e0aee..249ebab281d 100644
--- a/src/traces/sankey/render.js
+++ b/src/traces/sankey/render.js
@@ -13,179 +13,83 @@ var d3 = require('d3');
 var tinycolor = require('tinycolor2');
 var Color = require('../../components/color');
 var Drawing = require('../../components/drawing');
-var d3sankey = require('@plotly/d3-sankey').sankey;
+var d3Sankey = require('@plotly/d3-sankey');
+var d3SankeyCircular = require('d3-sankey-circular');
 var d3Force = require('d3-force');
 var Lib = require('../../lib');
-var isArrayOrTypedArray = Lib.isArrayOrTypedArray;
-var isIndex = Lib.isIndex;
 var gup = require('../../lib/gup');
 var keyFun = gup.keyFun;
 var repeat = gup.repeat;
 var unwrap = gup.unwrap;
-
-// basic data utilities
-
-function persistOriginalPlace(nodes) {
-    var i;
-    var distinctLayerPositions = [];
-    for(i = 0; i < nodes.length; i++) {
-        nodes[i].originalX = nodes[i].x;
-        nodes[i].originalY = nodes[i].y;
-        if(distinctLayerPositions.indexOf(nodes[i].x) === -1) {
-            distinctLayerPositions.push(nodes[i].x);
-        }
-    }
-    distinctLayerPositions.sort(function(a, b) {return a - b;});
-    for(i = 0; i < nodes.length; i++) {
-        nodes[i].originalLayerIndex = distinctLayerPositions.indexOf(nodes[i].originalX);
-        nodes[i].originalLayer = nodes[i].originalLayerIndex / (distinctLayerPositions.length - 1);
-    }
-}
-
-function saveCurrentDragPosition(d) {
-    d.lastDraggedX = d.x;
-    d.lastDraggedY = d.y;
-}
-
-function sameLayer(d) {
-    return function(n) {return n.node.originalX === d.node.originalX;};
-}
-
-function switchToForceFormat(nodes) {
-    // force uses x, y as centers
-    for(var i = 0; i < nodes.length; i++) {
-        nodes[i].y = nodes[i].y + nodes[i].dy / 2;
-    }
-}
-
-function switchToSankeyFormat(nodes) {
-    // sankey uses x, y as top left
-    for(var i = 0; i < nodes.length; i++) {
-        nodes[i].y = nodes[i].y - nodes[i].dy / 2;
-    }
-}
+var interpolateNumber = require('d3-interpolate').interpolateNumber;
 
 // view models
 
 function sankeyModel(layout, d, traceIndex) {
-    var trace = unwrap(d).trace;
+    var calcData = unwrap(d);
+    var trace = calcData.trace;
     var domain = trace.domain;
-    var nodeSpec = trace.node;
-    var linkSpec = trace.link;
-    var arrangement = trace.arrangement;
     var horizontal = trace.orientation === 'h';
     var nodePad = trace.node.pad;
     var nodeThickness = trace.node.thickness;
-    var nodeLineColor = trace.node.line.color;
-    var nodeLineWidth = trace.node.line.width;
-    var linkLineColor = trace.link.line.color;
-    var linkLineWidth = trace.link.line.width;
-    var valueFormat = trace.valueformat;
-    var valueSuffix = trace.valuesuffix;
-    var textFont = trace.textfont;
 
     var width = layout.width * (domain.x[1] - domain.x[0]);
     var height = layout.height * (domain.y[1] - domain.y[0]);
 
-    var links = [];
-    var hasLinkColorArray = isArrayOrTypedArray(linkSpec.color);
-    var linkedNodes = {};
-
-    var nodeCount = nodeSpec.label.length;
-    var i;
-    for(i = 0; i < linkSpec.value.length; i++) {
-        var val = linkSpec.value[i];
-        // remove negative values, but keep zeros with special treatment
-        var source = linkSpec.source[i];
-        var target = linkSpec.target[i];
-        if(!(val > 0 && isIndex(source, nodeCount) && isIndex(target, nodeCount))) {
-            continue;
-        }
-
-        source = +source;
-        target = +target;
-        linkedNodes[source] = linkedNodes[target] = true;
-
-        links.push({
-            pointNumber: i,
-            label: linkSpec.label[i],
-            color: hasLinkColorArray ? linkSpec.color[i] : linkSpec.color,
-            source: source,
-            target: target,
-            value: +val
-        });
-    }
-
-    var hasNodeColorArray = isArrayOrTypedArray(nodeSpec.color);
-    var nodes = [];
-    var removedNodes = false;
-    var nodeIndices = {};
-    for(i = 0; i < nodeCount; i++) {
-        if(linkedNodes[i]) {
-            var l = nodeSpec.label[i];
-            nodeIndices[i] = nodes.length;
-            nodes.push({
-                pointNumber: i,
-                label: l,
-                color: hasNodeColorArray ? nodeSpec.color[i] : nodeSpec.color
+    var nodes = calcData._nodes;
+    var links = calcData._links;
+    var circular = calcData.circular;
+
+    // Select Sankey generator
+    var sankey;
+    if(circular) {
+        sankey = d3SankeyCircular
+            .sankeyCircular()
+            .circularLinkGap(0)
+            .nodeId(function(d) {
+                return d.pointNumber;
             });
-        }
-        else removedNodes = true;
+    } else {
+        sankey = d3Sankey.sankey();
     }
 
-    // need to re-index links now, since we didn't put all the nodes in
-    if(removedNodes) {
-        for(i = 0; i < links.length; i++) {
-            links[i].source = nodeIndices[links[i].source];
-            links[i].target = nodeIndices[links[i].target];
-        }
-    }
+    sankey
+      .iterations(c.sankeyIterations)
+      .size(horizontal ? [width, height] : [height, width])
+      .nodeWidth(nodeThickness)
+      .nodePadding(nodePad)
+      .nodes(nodes)
+      .links(links);
 
-    var sankey = d3sankey()
-        .size(horizontal ? [width, height] : [height, width])
-        .nodeWidth(nodeThickness)
-        .nodePadding(nodePad)
-        .nodes(nodes)
-        .links(links)
-        .layout(c.sankeyIterations);
+    var graph = sankey();
 
     if(sankey.nodePadding() < nodePad) {
         Lib.warn('node.pad was reduced to ', sankey.nodePadding(), ' to fit within the figure.');
     }
 
-    var node;
-    var sankeyNodes = sankey.nodes();
-    for(var n = 0; n < sankeyNodes.length; n++) {
-        node = sankeyNodes[n];
-        node.width = width;
-        node.height = height;
-    }
-
-    switchToForceFormat(nodes);
-
     return {
+        circular: circular,
         key: traceIndex,
         trace: trace,
         guid: Math.floor(1e12 * (1 + Math.random())),
         horizontal: horizontal,
         width: width,
         height: height,
-        nodePad: nodePad,
-        nodeLineColor: nodeLineColor,
-        nodeLineWidth: nodeLineWidth,
-        linkLineColor: linkLineColor,
-        linkLineWidth: linkLineWidth,
-        valueFormat: valueFormat,
-        valueSuffix: valueSuffix,
-        textFont: textFont,
+        nodePad: trace.node.pad,
+        nodeLineColor: trace.node.line.color,
+        nodeLineWidth: trace.node.line.width,
+        linkLineColor: trace.link.line.color,
+        linkLineWidth: trace.link.line.width,
+        valueFormat: trace.valueformat,
+        valueSuffix: trace.valuesuffix,
+        textFont: trace.textfont,
         translateX: domain.x[0] * layout.width + layout.margin.l,
         translateY: layout.height - domain.y[1] * layout.height + layout.margin.t,
         dragParallel: horizontal ? height : width,
         dragPerpendicular: horizontal ? width : height,
-        nodes: nodes,
-        links: links,
-        arrangement: arrangement,
+        arrangement: trace.arrangement,
         sankey: sankey,
+        graph: graph,
         forceLayouts: {},
         interactionState: {
             dragInProgress: false,
@@ -194,20 +98,20 @@ function sankeyModel(layout, d, traceIndex) {
     };
 }
 
-function linkModel(uniqueKeys, d, l) {
+function linkModel(d, l, i) {
     var tc = tinycolor(l.color);
     var basicKey = l.source.label + '|' + l.target.label;
-    var foundKey = uniqueKeys[basicKey];
-    uniqueKeys[basicKey] = (foundKey || 0) + 1;
-    var key = basicKey + '__' + uniqueKeys[basicKey];
+    var key = basicKey + '__' + i;
 
     // for event data
     l.trace = d.trace;
     l.curveNumber = d.trace.index;
 
     return {
+        circular: d.circular,
         key: key,
         traceId: d.key,
+        pointNumber: l.pointNumber,
         link: l,
         tinyColorHue: Color.tinyRGB(tc),
         tinyColorAlpha: tc.getAlpha(),
@@ -216,27 +120,177 @@ function linkModel(uniqueKeys, d, l) {
         valueFormat: d.valueFormat,
         valueSuffix: d.valueSuffix,
         sankey: d.sankey,
+        parent: d,
         interactionState: d.interactionState
     };
 }
 
-function nodeModel(uniqueKeys, d, n) {
+function createCircularClosedPathString(link) {
+    // Using coordinates computed by d3-sankey-circular
+    var pathString = '';
+    var offset = link.width / 2;
+    var coords = link.circularPathData;
+    if(link.circularLinkType === 'top') {
+        // Top path
+        pathString =
+          // start at the left of the target node
+          'M ' +
+          coords.targetX + ' ' + (coords.targetY + offset) + ' ' +
+          'L' +
+          coords.rightInnerExtent + ' ' + (coords.targetY + offset) +
+          'A' +
+          (coords.rightLargeArcRadius + offset) + ' ' + (coords.rightSmallArcRadius + offset) + ' 0 0 1 ' +
+          (coords.rightFullExtent - offset) + ' ' + (coords.targetY - coords.rightSmallArcRadius) +
+          'L' +
+          (coords.rightFullExtent - offset) + ' ' + coords.verticalRightInnerExtent +
+          'A' +
+          (coords.rightLargeArcRadius + offset) + ' ' + (coords.rightLargeArcRadius + offset) + ' 0 0 1 ' +
+          coords.rightInnerExtent + ' ' + (coords.verticalFullExtent - offset) +
+          'L' +
+          coords.leftInnerExtent + ' ' + (coords.verticalFullExtent - offset) +
+          'A' +
+          (coords.leftLargeArcRadius + offset) + ' ' + (coords.leftLargeArcRadius + offset) + ' 0 0 1 ' +
+          (coords.leftFullExtent + offset) + ' ' + coords.verticalLeftInnerExtent +
+          'L' +
+          (coords.leftFullExtent + offset) + ' ' + (coords.sourceY - coords.leftSmallArcRadius) +
+          'A' +
+          (coords.leftLargeArcRadius + offset) + ' ' + (coords.leftSmallArcRadius + offset) + ' 0 0 1 ' +
+          coords.leftInnerExtent + ' ' + (coords.sourceY + offset) +
+          'L' +
+          coords.sourceX + ' ' + (coords.sourceY + offset) +
+
+          // Walking back
+          'L' +
+          coords.sourceX + ' ' + (coords.sourceY - offset) +
+          'L' +
+          coords.leftInnerExtent + ' ' + (coords.sourceY - offset) +
+          'A' +
+          (coords.leftLargeArcRadius - offset) + ' ' + (coords.leftSmallArcRadius - offset) + ' 0 0 0 ' +
+          (coords.leftFullExtent - offset) + ' ' + (coords.sourceY - coords.leftSmallArcRadius) +
+          'L' +
+          (coords.leftFullExtent - offset) + ' ' + coords.verticalLeftInnerExtent +
+          'A' +
+          (coords.leftLargeArcRadius - offset) + ' ' + (coords.leftLargeArcRadius - offset) + ' 0 0 0 ' +
+          coords.leftInnerExtent + ' ' + (coords.verticalFullExtent + offset) +
+          'L' +
+          coords.rightInnerExtent + ' ' + (coords.verticalFullExtent + offset) +
+          'A' +
+          (coords.rightLargeArcRadius - offset) + ' ' + (coords.rightLargeArcRadius - offset) + ' 0 0 0 ' +
+          (coords.rightFullExtent + offset) + ' ' + coords.verticalRightInnerExtent +
+          'L' +
+          (coords.rightFullExtent + offset) + ' ' + (coords.targetY - coords.rightSmallArcRadius) +
+          'A' +
+          (coords.rightLargeArcRadius - offset) + ' ' + (coords.rightSmallArcRadius - offset) + ' 0 0 0 ' +
+          coords.rightInnerExtent + ' ' + (coords.targetY - offset) +
+          'L' +
+          coords.targetX + ' ' + (coords.targetY - offset) +
+          'Z';
+    } else {
+        // Bottom path
+        pathString =
+          // start at the left of the target node
+          'M ' +
+          coords.targetX + ' ' + (coords.targetY - offset) + ' ' +
+          'L' +
+          coords.rightInnerExtent + ' ' + (coords.targetY - offset) +
+          'A' +
+          (coords.rightLargeArcRadius + offset) + ' ' + (coords.rightSmallArcRadius + offset) + ' 0 0 0 ' +
+          (coords.rightFullExtent - offset) + ' ' + (coords.targetY + coords.rightSmallArcRadius) +
+          'L' +
+          (coords.rightFullExtent - offset) + ' ' + coords.verticalRightInnerExtent +
+          'A' +
+          (coords.rightLargeArcRadius + offset) + ' ' + (coords.rightLargeArcRadius + offset) + ' 0 0 0 ' +
+          coords.rightInnerExtent + ' ' + (coords.verticalFullExtent + offset) +
+          'L' +
+          coords.leftInnerExtent + ' ' + (coords.verticalFullExtent + offset) +
+          'A' +
+          (coords.leftLargeArcRadius + offset) + ' ' + (coords.leftLargeArcRadius + offset) + ' 0 0 0 ' +
+          (coords.leftFullExtent + offset) + ' ' + coords.verticalLeftInnerExtent +
+          'L' +
+          (coords.leftFullExtent + offset) + ' ' + (coords.sourceY + coords.leftSmallArcRadius) +
+          'A' +
+          (coords.leftLargeArcRadius + offset) + ' ' + (coords.leftSmallArcRadius + offset) + ' 0 0 0 ' +
+          coords.leftInnerExtent + ' ' + (coords.sourceY - offset) +
+          'L' +
+          coords.sourceX + ' ' + (coords.sourceY - offset) +
+
+          // Walking back
+          'L' +
+          coords.sourceX + ' ' + (coords.sourceY + offset) +
+          'L' +
+          coords.leftInnerExtent + ' ' + (coords.sourceY + offset) +
+          'A' +
+          (coords.leftLargeArcRadius - offset) + ' ' + (coords.leftSmallArcRadius - offset) + ' 0 0 1 ' +
+          (coords.leftFullExtent - offset) + ' ' + (coords.sourceY + coords.leftSmallArcRadius) +
+          'L' +
+          (coords.leftFullExtent - offset) + ' ' + coords.verticalLeftInnerExtent +
+          'A' +
+          (coords.leftLargeArcRadius - offset) + ' ' + (coords.leftLargeArcRadius - offset) + ' 0 0 1 ' +
+          coords.leftInnerExtent + ' ' + (coords.verticalFullExtent - offset) +
+          'L' +
+          coords.rightInnerExtent + ' ' + (coords.verticalFullExtent - offset) +
+          'A' +
+          (coords.rightLargeArcRadius - offset) + ' ' + (coords.rightLargeArcRadius - offset) + ' 0 0 1 ' +
+          (coords.rightFullExtent + offset) + ' ' + coords.verticalRightInnerExtent +
+          'L' +
+          (coords.rightFullExtent + offset) + ' ' + (coords.targetY + coords.rightSmallArcRadius) +
+          'A' +
+          (coords.rightLargeArcRadius - offset) + ' ' + (coords.rightSmallArcRadius - offset) + ' 0 0 1 ' +
+          coords.rightInnerExtent + ' ' + (coords.targetY + offset) +
+          'L' +
+          coords.targetX + ' ' + (coords.targetY + offset) +
+          'Z';
+    }
+    return pathString;
+}
+
+function linkPath() {
+    var curvature = 0.5;
+    function path(d) {
+        if(d.link.circular) {
+            return createCircularClosedPathString(d.link);
+        } else {
+            var x0 = d.link.source.x1;
+            var x1 = d.link.target.x0;
+            var xi = interpolateNumber(x0, x1);
+            var x2 = xi(curvature);
+            var x3 = xi(1 - curvature);
+            var y0a = d.link.y0 - d.link.width / 2;
+            var y0b = d.link.y0 + d.link.width / 2;
+            var y1a = d.link.y1 - d.link.width / 2;
+            var y1b = d.link.y1 + d.link.width / 2;
+            return 'M' + x0 + ',' + y0a +
+                 'C' + x2 + ',' + y0a +
+                 ' ' + x3 + ',' + y1a +
+                 ' ' + x1 + ',' + y1a +
+                 'L' + x1 + ',' + y1b +
+                 'C' + x3 + ',' + y1b +
+                 ' ' + x2 + ',' + y0b +
+                 ' ' + x0 + ',' + y0b +
+                 'Z';
+        }
+    }
+    return path;
+}
+
+function nodeModel(d, n, i) {
     var tc = tinycolor(n.color);
     var zoneThicknessPad = c.nodePadAcross;
     var zoneLengthPad = d.nodePad / 2;
+    n.dx = n.x1 - n.x0;
+    n.dy = n.y1 - n.y0;
     var visibleThickness = n.dx;
     var visibleLength = Math.max(0.5, n.dy);
 
     var basicKey = n.label;
-    var foundKey = uniqueKeys[basicKey];
-    uniqueKeys[basicKey] = (foundKey || 0) + 1;
-    var key = basicKey + '__' + uniqueKeys[basicKey];
+    var key = basicKey + '__' + i;
 
     // for event data
     n.trace = d.trace;
     n.curveNumber = d.trace.index;
 
     return {
+        index: n.pointNumber,
         key: key,
         traceId: d.key,
         node: n,
@@ -262,8 +316,9 @@ function nodeModel(uniqueKeys, d, n) {
         valueFormat: d.valueFormat,
         valueSuffix: d.valueSuffix,
         sankey: d.sankey,
+        graph: d.graph,
         arrangement: d.arrangement,
-        uniqueNodeLabelPathId: [d.guid, d.key, key].join(' '),
+        uniqueNodeLabelPathId: [d.guid, d.key, key].join('_'),
         interactionState: d.interactionState
     };
 }
@@ -273,33 +328,26 @@ function nodeModel(uniqueKeys, d, n) {
 function updateNodePositions(sankeyNode) {
     sankeyNode
         .attr('transform', function(d) {
-            return 'translate(' + d.node.x.toFixed(3) + ', ' + (d.node.y - d.node.dy / 2).toFixed(3) + ')';
+            return 'translate(' + d.node.x0.toFixed(3) + ', ' + (d.node.y0).toFixed(3) + ')';
         });
 }
 
-function linkPath(d) {
-    var nodes = d.sankey.nodes();
-    switchToSankeyFormat(nodes);
-    var result = d.sankey.link()(d.link);
-    switchToForceFormat(nodes);
-    return result;
-}
-
 function updateNodeShapes(sankeyNode) {
     sankeyNode.call(updateNodePositions);
 }
 
 function updateShapes(sankeyNode, sankeyLink) {
     sankeyNode.call(updateNodeShapes);
-    sankeyLink.attr('d', linkPath);
+    sankeyLink.attr('d', linkPath());
 }
 
 function sizeNode(rect) {
-    rect.attr('width', function(d) {return d.visibleWidth;})
-        .attr('height', function(d) {return d.visibleHeight;});
+    rect
+      .attr('width', function(d) {return d.node.x1 - d.node.x0;})
+      .attr('height', function(d) {return d.visibleHeight;});
 }
 
-function salientEnough(d) {return d.link.dy > 1 || d.linkLineWidth > 0;}
+function salientEnough(d) {return (d.link.width > 1 || d.linkLineWidth > 0);}
 
 function sankeyTransform(d) {
     var offset = 'translate(' + d.translateX + ',' + d.translateY + ')';
@@ -356,25 +404,29 @@ function attachPointerEvents(selection, sankey, eventSet) {
 }
 
 function attachDragHandler(sankeyNode, sankeyLink, callbacks) {
-
     var dragBehavior = d3.behavior.drag()
-
-        .origin(function(d) {return d.node;})
+        .origin(function(d) {
+            return {
+                x: d.node.x0,
+                y: d.node.y0
+            };
+        })
 
         .on('dragstart', function(d) {
             if(d.arrangement === 'fixed') return;
             Lib.raiseToTop(this);
             d.interactionState.dragInProgress = d.node;
+
             saveCurrentDragPosition(d.node);
             if(d.interactionState.hovered) {
                 callbacks.nodeEvents.unhover.apply(0, d.interactionState.hovered);
                 d.interactionState.hovered = false;
             }
             if(d.arrangement === 'snap') {
-                var forceKey = d.traceId + '|' + Math.floor(d.node.originalX);
+                var forceKey = d.traceId + '|' + d.key;
                 if(d.forceLayouts[forceKey]) {
                     d.forceLayouts[forceKey].alpha(1);
-                } else { // make a forceLayout iff needed
+                } else { // make a forceLayout if needed
                     attachForce(sankeyNode, forceKey, d);
                 }
                 startForce(sankeyNode, sankeyLink, d, forceKey);
@@ -386,17 +438,22 @@ function attachDragHandler(sankeyNode, sankeyLink, callbacks) {
             var x = d3.event.x;
             var y = d3.event.y;
             if(d.arrangement === 'snap') {
-                d.node.x = x;
-                d.node.y = y;
+                d.node.x0 = x - d.visibleWidth / 2;
+                d.node.x1 = x + d.visibleWidth / 2;
+                d.node.y0 = y - d.visibleHeight / 2;
+                d.node.y1 = y + d.visibleHeight / 2;
             } else {
                 if(d.arrangement === 'freeform') {
-                    d.node.x = x;
+                    d.node.x0 = x - d.visibleWidth / 2;
+                    d.node.x1 = x + d.visibleWidth / 2;
                 }
-                d.node.y = Math.max(d.node.dy / 2, Math.min(d.size - d.node.dy / 2, y));
+                d.node.y0 = Math.max(0, Math.min(d.size - d.visibleHeight, y));
+                d.node.y1 = d.node.y0 + d.visibleHeight;
             }
+
             saveCurrentDragPosition(d.node);
             if(d.arrangement !== 'snap') {
-                d.sankey.relayout();
+                d.sankey.update(d.graph);
                 updateShapes(sankeyNode.filter(sameLayer(d)), sankeyLink);
             }
         })
@@ -411,7 +468,9 @@ function attachDragHandler(sankeyNode, sankeyLink, callbacks) {
 }
 
 function attachForce(sankeyNode, forceKey, d) {
-    var nodes = d.sankey.nodes().filter(function(n) {return n.originalX === d.node.originalX;});
+    // Attach force to nodes in the same column (same x coordinate)
+    switchToForceFormat(d.graph.nodes);
+    var nodes = d.graph.nodes.filter(function(n) {return n.originalX === d.node.originalX;});
     d.forceLayouts[forceKey] = d3Force.forceSimulation(nodes)
         .alphaDecay(0)
         .force('collide', d3Force.forceCollide()
@@ -424,11 +483,17 @@ function attachForce(sankeyNode, forceKey, d) {
 
 function startForce(sankeyNode, sankeyLink, d, forceKey) {
     window.requestAnimationFrame(function faster() {
-        for(var i = 0; i < c.forceTicksPerFrame; i++) {
+        var i;
+        for(i = 0; i < c.forceTicksPerFrame; i++) {
             d.forceLayouts[forceKey].tick();
         }
-        d.sankey.relayout();
+
+        var nodes = d.graph.nodes;
+        switchToSankeyFormat(nodes);
+
+        d.sankey.update(d.graph);
         updateShapes(sankeyNode.filter(sameLayer(d)), sankeyLink);
+
         if(d.forceLayouts[forceKey].alpha() > 0) {
             window.requestAnimationFrame(faster);
         }
@@ -455,13 +520,62 @@ function snappingForce(sankeyNode, forceKey, nodes, d) {
     };
 }
 
+// basic data utilities
+
+function persistOriginalPlace(nodes) {
+    var distinctLayerPositions = [];
+    var i;
+    for(i = 0; i < nodes.length; i++) {
+        nodes[i].originalX = (nodes[i].x0 + nodes[i].x1) / 2;
+        nodes[i].originalY = (nodes[i].y0 + nodes[i].y1) / 2;
+        if(distinctLayerPositions.indexOf(nodes[i].originalX) === -1) {
+            distinctLayerPositions.push(nodes[i].originalX);
+        }
+    }
+    distinctLayerPositions.sort(function(a, b) {return a - b;});
+    for(i = 0; i < nodes.length; i++) {
+        nodes[i].originalLayerIndex = distinctLayerPositions.indexOf(nodes[i].originalX);
+        nodes[i].originalLayer = nodes[i].originalLayerIndex / (distinctLayerPositions.length - 1);
+    }
+}
+
+function saveCurrentDragPosition(d) {
+    d.lastDraggedX = d.x0 + d.dx / 2;
+    d.lastDraggedY = d.y0 + d.dy / 2;
+}
+
+function sameLayer(d) {
+    return function(n) {return n.node.originalX === d.node.originalX;};
+}
+
+function switchToForceFormat(nodes) {
+    // force uses x, y as centers
+    for(var i = 0; i < nodes.length; i++) {
+        nodes[i].y = nodes[i].y0 + nodes[i].dy / 2;
+        nodes[i].x = nodes[i].x0 + nodes[i].dx / 2;
+    }
+}
+
+function switchToSankeyFormat(nodes) {
+    // sankey uses x0, x1, y0, y1
+    for(var i = 0; i < nodes.length; i++) {
+        nodes[i].y0 = nodes[i].y - nodes[i].dy / 2;
+        nodes[i].y1 = nodes[i].y0 + nodes[i].dy;
+
+        nodes[i].x0 = nodes[i].x - nodes[i].dx / 2;
+        nodes[i].x1 = nodes[i].x0 + nodes[i].dx;
+    }
+}
+
 // scene graph
-module.exports = function(svg, styledData, layout, callbacks) {
+module.exports = function(svg, calcData, layout, callbacks) {
+
+    var styledData = calcData
+            .filter(function(d) {return unwrap(d).trace.visible;})
+            .map(sankeyModel.bind(null, layout));
+
     var sankey = svg.selectAll('.' + c.cn.sankey)
-        .data(styledData
-                .filter(function(d) {return unwrap(d).trace.visible;})
-                .map(sankeyModel.bind(null, layout)),
-            keyFun);
+        .data(styledData, keyFun);
 
     sankey.exit()
         .remove();
@@ -489,18 +603,18 @@ module.exports = function(svg, styledData, layout, callbacks) {
         .style('fill', 'none');
 
     var sankeyLink = sankeyLinks.selectAll('.' + c.cn.sankeyLink)
-        .data(function(d) {
-            var uniqueKeys = {};
-            return d.sankey.links()
+          .data(function(d) {
+              var links = d.graph.links;
+              return links
                 .filter(function(l) {return l.value;})
-                .map(linkModel.bind(null, uniqueKeys, d));
-        }, keyFun);
+                .map(linkModel.bind(null, d));
+          }, keyFun);
 
-    sankeyLink.enter()
-        .append('path')
-        .classed(c.cn.sankeyLink, true)
-        .attr('d', linkPath)
-        .call(attachPointerEvents, sankey, callbacks.linkEvents);
+    sankeyLink
+          .enter().append('path')
+          .classed(c.cn.sankeyLink, true)
+          .attr('d', linkPath())
+          .call(attachPointerEvents, sankey, callbacks.linkEvents);
 
     sankeyLink
         .style('stroke', function(d) {
@@ -509,13 +623,19 @@ module.exports = function(svg, styledData, layout, callbacks) {
         .style('stroke-opacity', function(d) {
             return salientEnough(d) ? Color.opacity(d.linkLineColor) : d.tinyColorAlpha;
         })
-        .style('stroke-width', function(d) {return salientEnough(d) ? d.linkLineWidth : 1;})
-        .style('fill', function(d) {return d.tinyColorHue;})
-        .style('fill-opacity', function(d) {return d.tinyColorAlpha;});
+        .style('fill', function(d) {
+            return d.tinyColorHue;
+        })
+        .style('fill-opacity', function(d) {
+            return d.tinyColorAlpha;
+        })
+        .style('stroke-width', function(d) {
+            return salientEnough(d) ? d.linkLineWidth : 1;
+        });
 
     sankeyLink.transition()
-        .ease(c.ease).duration(c.duration)
-        .attr('d', linkPath);
+       .ease(c.ease).duration(c.duration)
+       .attr('d', linkPath());
 
     sankeyLink.exit().transition()
         .ease(c.ease).duration(c.duration)
@@ -540,12 +660,11 @@ module.exports = function(svg, styledData, layout, callbacks) {
 
     var sankeyNode = sankeyNodeSet.selectAll('.' + c.cn.sankeyNode)
         .data(function(d) {
-            var nodes = d.sankey.nodes();
-            var uniqueKeys = {};
+            var nodes = d.graph.nodes;
             persistOriginalPlace(nodes);
             return nodes
                 .filter(function(n) {return n.value;})
-                .map(nodeModel.bind(null, uniqueKeys, d));
+                .map(nodeModel.bind(null, d));
         }, keyFun);
 
     sankeyNode.enter()
diff --git a/test/image/baselines/sankey_circular.png b/test/image/baselines/sankey_circular.png
new file mode 100644
index 00000000000..f2ba831b652
Binary files /dev/null and b/test/image/baselines/sankey_circular.png differ
diff --git a/test/image/baselines/sankey_circular_large.png b/test/image/baselines/sankey_circular_large.png
new file mode 100644
index 00000000000..600ff74b614
Binary files /dev/null and b/test/image/baselines/sankey_circular_large.png differ
diff --git a/test/image/baselines/sankey_circular_process.png b/test/image/baselines/sankey_circular_process.png
new file mode 100644
index 00000000000..438062a1dd1
Binary files /dev/null and b/test/image/baselines/sankey_circular_process.png differ
diff --git a/test/image/baselines/sankey_circular_simple.png b/test/image/baselines/sankey_circular_simple.png
new file mode 100644
index 00000000000..8c6a99f2e26
Binary files /dev/null and b/test/image/baselines/sankey_circular_simple.png differ
diff --git a/test/image/baselines/sankey_large_padding.png b/test/image/baselines/sankey_large_padding.png
index 38d263f799d..b27b24c12eb 100644
Binary files a/test/image/baselines/sankey_large_padding.png and b/test/image/baselines/sankey_large_padding.png differ
diff --git a/test/image/baselines/sankey_subplots_circular.png b/test/image/baselines/sankey_subplots_circular.png
new file mode 100644
index 00000000000..9d744f00ca4
Binary files /dev/null and b/test/image/baselines/sankey_subplots_circular.png differ
diff --git a/test/image/mocks/sankey_circular.json b/test/image/mocks/sankey_circular.json
new file mode 100644
index 00000000000..a8b454f5997
--- /dev/null
+++ b/test/image/mocks/sankey_circular.json
@@ -0,0 +1,26 @@
+{
+    "data": [
+        {
+            "type": "sankey",
+            "node": {
+                "pad": 5,
+                "label": ["0", "1", "2", "3", "4", "5", "6"]
+            },
+            "link": {
+                "source": [
+                    0, 0, 1, 2, 5, 4, 3
+                ],
+                "target": [
+                    5, 3, 4, 3, 0, 2, 2
+                ],
+                "value": [
+                    1, 2, 1, 1, 1, 1, 1
+                ]
+            }
+        }],
+    "layout": {
+        "title": "Sankey with circular data",
+        "width": 800,
+        "height": 800
+    }
+}
diff --git a/test/image/mocks/sankey_circular_large.json b/test/image/mocks/sankey_circular_large.json
new file mode 100644
index 00000000000..6af23521291
--- /dev/null
+++ b/test/image/mocks/sankey_circular_large.json
@@ -0,0 +1,230 @@
+{
+  "data": [{
+    "type": "sankey",
+    "node": {
+      "label": ["node_0", "node_2", "node_4", "node_6", "node_9", "node_11", "node_14", "node_16", "node_13", "node_18", "node_17", "node_7", "node_20", "node_1", "node_3", "node_5", "node_15", "node_10", "node_12", "node_8", "node_19", "node_21", "node_22", "node_23", "node_24", "node_25"]
+    },
+    "link": {
+      "source": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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+        ]
+      }, {
+        "label": "label_24",
+        "colorscale": [
+          [0, "white"],
+          [1, "#9467bd"]
+        ]
+      }, {
+        "label": "label_25",
+        "colorscale": [
+          [0, "white"],
+          [1, "#8c564b"]
+        ]
+      }, {
+        "label": "label_26",
+        "colorscale": [
+          [0, "white"],
+          [1, "#e377c2"]
+        ]
+      }, {
+        "label": "label_27",
+        "colorscale": [
+          [0, "white"],
+          [1, "#7f7f7f"]
+        ]
+      }, {
+        "label": "label_28",
+        "colorscale": [
+          [0, "white"],
+          [1, "#bcbd22"]
+        ]
+      }, {
+        "label": "label_29",
+        "colorscale": [
+          [0, "white"],
+          [1, "#17becf"]
+        ]
+      }, {
+        "label": "label_30",
+        "colorscale": [
+          [0, "white"],
+          [1, "#1f77b4"]
+        ]
+      }, {
+        "label": "label_31",
+        "colorscale": [
+          [0, "white"],
+          [1, "#ff7f0e"]
+        ]
+      }, {
+        "label": "label_32",
+        "colorscale": [
+          [0, "white"],
+          [1, "#2ca02c"]
+        ]
+      }, {
+        "label": "label_33",
+        "colorscale": [
+          [0, "white"],
+          [1, "#d62728"]
+        ]
+      }, {
+        "label": "label_34",
+        "colorscale": [
+          [0, "white"],
+          [1, "#9467bd"]
+        ]
+      }],
+      "hovertemplate": "<b>%{label}</b><br>%{flow.labelConcentration:%0.2f}<br>%{flow.value}"
+    }
+  }],
+  "layout": {
+      "width": 800,
+      "height": 800
+  }
+}
diff --git a/test/image/mocks/sankey_circular_process.json b/test/image/mocks/sankey_circular_process.json
new file mode 100644
index 00000000000..6e04c9392e4
--- /dev/null
+++ b/test/image/mocks/sankey_circular_process.json
@@ -0,0 +1,28 @@
+{
+  "data": [{
+    "type": "sankey",
+    "node": {
+      "line": {
+        "width": 1,
+        "color": "black"
+      },
+      "pad": 5,
+      "label": ["startA", "startB", "process1", "process2", "process3", "process4", "process5", "process6", "process7", "process8", "process9", "process10", "process11", "process12", "process13", "process14", "process15", "process16", "finishA", "finishB"]
+    },
+    "link": {
+      "line": {
+        "width": 1,
+        "color": "black"
+      },
+      "source": [0, 0, 0, 1, 1, 2, 5, 3, 2, 6, 7, 5, 7, 5, 4, 4, 16, 14, 8, 9, 9, 17, 9, 12, 5, 13, 8, 16, 11, 11, 15, 10, 17, 10, 16, 16, 12],
+      "target": [9, 6, 7, 2, 6, 5, 2, 8, 4, 2, 0, 3, 9, 1, 3, 1, 14, 10, 1, 2, 17, 10, 12, 11, 13, 12, 16, 15, 14, 17, 19, 18, 9, 19, 19, 18, 16],
+      "value": [20, 20, 20, 15, 15, 30, 10, 35, 20, 20, 5, 5, 15, 5, 15, 5, 10, 10, 20, 10, 10, 10, 25, 20, 10, 10, 15, 10, 10, 10, 10, 10, 10, 10, 10, 10, 25]
+    }
+  }],
+  "layout": {
+    "title": "Example process",
+    "margin": {"t": 100, "b": 0, "l": 25, "r": 25},
+    "width": 1000,
+    "height": 800
+  }
+}
diff --git a/test/image/mocks/sankey_circular_simple.json b/test/image/mocks/sankey_circular_simple.json
new file mode 100644
index 00000000000..cff172479f7
--- /dev/null
+++ b/test/image/mocks/sankey_circular_simple.json
@@ -0,0 +1,31 @@
+{
+    "data": [
+        {
+            "type": "sankey",
+            "node": {
+                "pad": 5,
+                "label": ["0", "1", "2", "3", "sink", "source"]
+            },
+            "link": {
+                "source": [
+                    0, 1, 2, 3,
+                    0, 1, 2, 3,
+                    5
+                ],
+                "target": [
+                    1, 2, 3, 0,
+                    4, 4, 4, 4,
+                    0
+                ],
+                "value": [
+                    1, 0.85, 0.7, 0.55,
+                    0, 0.15, 0.15, 0.15,
+                    0.45
+                ]
+            }
+        }],
+    "layout": {
+        "width": 800,
+        "height": 800
+    }
+}
diff --git a/test/image/mocks/sankey_subplots_circular.json b/test/image/mocks/sankey_subplots_circular.json
new file mode 100644
index 00000000000..cfde57db330
--- /dev/null
+++ b/test/image/mocks/sankey_subplots_circular.json
@@ -0,0 +1,65 @@
+{
+    "data": [{
+            "domain": {
+                "x": [0, 0.45]
+            },
+            "type": "sankey",
+            "orientation": "h",
+            "node": {
+                "line": {
+                    "color": "black",
+                    "width": 1
+                },
+                "label": ["el1", "el2", "el3"]
+            },
+            "link": {
+                "source": [0, 2, 1],
+                "target": [1, 1, 2],
+                "value": [120, 50, 30],
+                "color": "purple",
+                "label": ["stram1", "stream2", "stream3"],
+                "line": {
+                    "color": "black",
+                    "width": 1
+                }
+            }
+        },
+        {
+            "domain": {
+                "x": [0.55, 1]
+            },
+            "type": "sankey",
+            "orientation": "v",
+            "node": {
+                "line": {
+                    "color": "black",
+                    "width": 1
+                },
+                "label": ["el4", "el5", "el6", "el7", "el8"]
+            },
+            "link": {
+                "source": [0, 2, 1, 3, 4, 1],
+                "target": [1, 1, 2, 2, 2, 4],
+                "value": [120, 50, 30, 70, 25, 10],
+                "color": "rgba(0, 0, 0, 0.1)",
+                "label": ["stram4", "stream5", "stream6", "stream7", "stream8", "stream9"],
+                "line": {
+                    "color": "black",
+                    "width": 1
+                }
+            }
+        }
+    ],
+    "layout": {
+        "title": "Multiple Sankey plots with circular links",
+        "width": 800,
+        "height": 300,
+        "margin": {
+          "t": 50,
+          "l": 10,
+          "r": 10,
+          "b": 10
+        },
+        "showlegend": false
+    }
+}
diff --git a/test/jasmine/tests/sankey_test.js b/test/jasmine/tests/sankey_test.js
index 27a19406860..d2a7391d8ed 100644
--- a/test/jasmine/tests/sankey_test.js
+++ b/test/jasmine/tests/sankey_test.js
@@ -2,8 +2,12 @@ var Plotly = require('@lib/index');
 var attributes = require('@src/traces/sankey/attributes');
 var Lib = require('@src/lib');
 var d3 = require('d3');
+var d3sankey = require('@plotly/d3-sankey');
+var d3SankeyCircular = require('d3-sankey-circular');
 var mock = require('@mocks/sankey_energy.json');
 var mockDark = require('@mocks/sankey_energy_dark.json');
+var mockCircular = require('@mocks/sankey_circular.json');
+var mockCircularLarge = require('@mocks/sankey_circular_large.json');
 var Sankey = require('@src/traces/sankey');
 
 var createGraphDiv = require('../assets/create_graph_div');
@@ -240,69 +244,42 @@ describe('sankey tests', function() {
     });
 
     describe('sankey calc', function() {
-
         function _calc(trace) {
             var gd = { data: [trace] };
 
             supplyAllDefaults(gd);
             var fullTrace = gd._fullData[0];
-            Sankey.calc(gd, fullTrace);
-            return fullTrace;
+            return Sankey.calc(gd, fullTrace);
         }
 
         var base = { type: 'sankey' };
 
-        describe('remove nodes if encountering circularity', function() {
-            var errors;
-
-            beforeEach(function() {
-                errors = [];
-                spyOn(Lib, 'error').and.callFake(function(msg) {
-                    errors.push(msg);
-                });
-            });
-
-            it('removing a single self-pointing node', function() {
-                expect(errors.length).toBe(0);
-
-                var fullTrace = _calc(Lib.extendDeep({}, base, {
-                    node: {
-                        label: ['a']
-                    },
-                    link: {
-                        value: [1],
-                        source: [0],
-                        target: [0]
-                    }
-                }));
-
-                expect(fullTrace.node.label).toEqual([], 'node label(s) removed');
-                expect(fullTrace.link.value).toEqual([], 'link value(s) removed');
-                expect(fullTrace.link.source).toEqual([], 'link source(s) removed');
-                expect(fullTrace.link.target).toEqual([], 'link target(s) removed');
-                expect(errors.length).toBe(1);
-            });
+        it('detects circularity', function() {
+            var calcData = _calc(Lib.extendDeep({}, base, {
+                node: {
+                    label: ['a', 'b', 'c', 'd', 'e']
+                },
+                link: {
+                    value: [1, 1, 1, 1, 1, 1, 1, 1],
+                    source: [0, 1, 2, 3],
+                    target: [1, 2, 0, 4]
+                }
+            }));
+            expect(calcData[0].circular).toBeTruthy();
+        });
 
-            it('removing everything if detecting a circle', function() {
-                expect(errors.length).toBe(0);
-
-                var fullTrace = _calc(Lib.extendDeep({}, base, {
-                    node: {
-                        label: ['a', 'b', 'c', 'd', 'e']
-                    },
-                    link: {
-                        value: [1, 1, 1, 1, 1, 1, 1, 1],
-                        source: [0, 1, 2, 3],
-                        target: [1, 2, 0, 4]
-                    }
-                }));
-
-                expect(fullTrace.node.label).toEqual([], 'node label(s) removed');
-                expect(fullTrace.link.value).toEqual([], 'link value(s) removed');
-                expect(fullTrace.link.source).toEqual([], 'link source(s) removed');
-                expect(fullTrace.link.target).toEqual([], 'link target(s) removed');
-                expect(errors.length).toBe(1);
-            });
+        it('detects the absence of circularity', function() {
+            var calcData = _calc(Lib.extendDeep({}, base, {
+                node: {
+                    label: ['a', 'b', 'c', 'd', 'e']
+                },
+                link: {
+                    value: [1, 1, 1, 1, 1, 1, 1, 1],
+                    source: [0, 1, 2, 3],
+                    target: [1, 2, 4, 4]
+                }
+            }));
+            expect(calcData[0].circular).toBe(false);
         });
     });
 
@@ -383,6 +360,47 @@ describe('sankey tests', function() {
                     done();
                 });
         });
+
+        it('switch from normal to circular Sankey on react', function(done) {
+            var gd = createGraphDiv();
+            var mockCopy = Lib.extendDeep({}, mock);
+            var mockCircularCopy = Lib.extendDeep({}, mockCircular);
+
+            Plotly.plot(gd, mockCopy)
+              .then(function() {
+                  expect(gd.calcdata[0][0].circular).toBe(false);
+                  return Plotly.react(gd, mockCircularCopy);
+              })
+              .then(function() {
+                  expect(gd.calcdata[0][0].circular).toBe(true);
+                  done();
+              });
+        });
+
+        it('switch from circular to normal Sankey on react', function(done) {
+            var gd = createGraphDiv();
+            var mockCircularCopy = Lib.extendDeep({}, mockCircular);
+
+            Plotly.plot(gd, mockCircularCopy)
+              .then(function() {
+                  expect(gd.calcdata[0][0].circular).toBe(true);
+
+                  // Remove circular links
+                  var source = mockCircularCopy.data[0].link.source;
+                  source.splice(6, 1);
+                  source.splice(4, 1);
+
+                  var target = mockCircularCopy.data[0].link.target;
+                  target.splice(6, 1);
+                  target.splice(4, 1);
+
+                  return Plotly.react(gd, mockCircularCopy);
+              })
+              .then(function() {
+                  expect(gd.calcdata[0][0].circular).toBe(false);
+                  done();
+              });
+        });
     });
 
     describe('Test hover/click interactions:', function() {
@@ -931,3 +949,293 @@ function assertNoLabel() {
     var g = d3.selectAll('.hovertext');
     expect(g.size()).toBe(0);
 }
+
+describe('sankey layout generators', function() {
+    function checkArray(arr, key, result) {
+        var value = arr.map(function(obj) {
+            return obj[key];
+        });
+        expect(value).toEqual(result, 'invalid property named ' + key);
+    }
+
+    function checkRoundedArray(arr, key, result) {
+        var value = arr.map(function(obj) {
+            return Math.round(obj[key]);
+        });
+        expect(value).toEqual(result, 'invalid property named ' + key);
+    }
+
+    function moveNode(sankey, graph, nodeIndex, delta) {
+        var node = graph.nodes[nodeIndex];
+        var pos0 = [node.x0, node.y0];
+        var pos1 = [node.x1, node.y1];
+
+        // Update node's position
+        node.x0 += delta[0];
+        node.x1 += delta[0];
+        node.y0 += delta[1];
+        node.y1 += delta[1];
+
+        // Update links
+        var updatedGraph = sankey.update(graph);
+
+        // Check node position
+        expect(updatedGraph.nodes[nodeIndex].x0).toBeCloseTo(pos0[0] + delta[0], 0);
+        expect(updatedGraph.nodes[nodeIndex].x1).toBeCloseTo(pos1[0] + delta[0], 0);
+        expect(updatedGraph.nodes[nodeIndex].y0).toBeCloseTo(pos0[1] + delta[1], 0);
+        expect(updatedGraph.nodes[nodeIndex].y1).toBeCloseTo(pos1[1] + delta[1], 0);
+
+        return updatedGraph;
+    }
+
+    describe('d3-sankey', function() {
+        var data = {
+            'nodes': [{
+                'node': 0,
+                'name': 'node0'
+            }, {
+                'node': 1,
+                'name': 'node1'
+            }, {
+                'node': 2,
+                'name': 'node2'
+            }, {
+                'node': 3,
+                'name': 'node3'
+            }, {
+                'node': 4,
+                'name': 'node4'
+            }],
+            'links': [{
+                'source': 0,
+                'target': 2,
+                'value': 2
+            }, {
+                'source': 1,
+                'target': 2,
+                'value': 2
+            }, {
+                'source': 1,
+                'target': 3,
+                'value': 2
+            }, {
+                'source': 0,
+                'target': 4,
+                'value': 2
+            }, {
+                'source': 2,
+                'target': 3,
+                'value': 2
+            }, {
+                'source': 2,
+                'target': 4,
+                'value': 2
+            }, {
+                'source': 3,
+                'target': 4,
+                'value': 4
+            }]
+        };
+        var sankey;
+        var graph;
+        var margin = {
+            top: 10,
+            right: 10,
+            bottom: 10,
+            left: 10
+        };
+        var width = 1200 - margin.left - margin.right;
+        var height = 740 - margin.top - margin.bottom;
+
+        beforeEach(function() {
+            sankey = d3sankey
+            .sankey()
+            .nodeWidth(36)
+            .nodePadding(10)
+            .nodes(data.nodes)
+            .links(data.links)
+            .size([width, height])
+            .iterations(32);
+
+            graph = sankey();
+        });
+
+        it('controls the width of nodes', function() {
+            expect(sankey.nodeWidth()).toEqual(36, 'incorrect nodeWidth');
+        });
+
+        it('controls the padding between nodes', function() {
+            expect(sankey.nodePadding()).toEqual(10, 'incorrect nodePadding');
+        });
+
+        it('controls the padding between nodes', function() {
+            expect(sankey.nodePadding()).toEqual(10, 'incorrect nodePadding');
+        });
+
+        it('keep a list of nodes', function() {
+            checkArray(graph.nodes, 'name', ['node0', 'node1', 'node2', 'node3', 'node4']);
+        });
+
+        it('keep a list of nodes with x and y values', function() {
+            checkRoundedArray(graph.nodes, 'x0', [0, 0, 381, 763, 1144]);
+            checkRoundedArray(graph.nodes, 'y0', [0, 365, 184, 253, 0]);
+        });
+
+        it('keep a list of nodes with positions in integer (depth, height)', function() {
+            checkArray(graph.nodes, 'depth', [0, 0, 1, 2, 3]);
+            checkArray(graph.nodes, 'height', [3, 3, 2, 1, 0]);
+        });
+
+        it('keep a list of links', function() {
+            var linkWidths = sankey().links.map(function(obj) {
+                return (obj.width);
+            });
+            expect(linkWidths).toEqual([177.5, 177.5, 177.5, 177.5, 177.5, 177.5, 355]);
+        });
+
+        it('controls the size of the figure', function() {
+            expect(sankey.size()).toEqual([1180, 720], 'incorrect size');
+        });
+
+        it('updates links vertical position upon moving nodes', function() {
+            var nodeIndex = 0;
+            var linkIndex = 0;
+            var delta = [200, 300];
+
+            var linkY0 = graph.links[linkIndex].y0;
+            var updatedGraph = moveNode(sankey, graph, nodeIndex, delta);
+            expect(updatedGraph.links[linkIndex].y0).toBeCloseTo(linkY0 + delta[1]);
+        });
+    });
+
+    describe('d3-sankey-ciruclar', function() {
+        var data, sankey, graph;
+
+        describe('implements d3-sankey compatible API', function() {
+            function _calc(trace) {
+                var gd = { data: [trace] };
+
+                supplyAllDefaults(gd);
+                var fullTrace = gd._fullData[0];
+                return Sankey.calc(gd, fullTrace);
+            }
+
+            beforeEach(function() {
+                data = _calc(mockCircular.data[0]);
+                data = {
+                    nodes: data[0]._nodes,
+                    links: data[0]._links
+                };
+                sankey = d3SankeyCircular
+                  .sankeyCircular()
+                  .iterations(32)
+                  .circularLinkGap(2)
+                  .nodePadding(10)
+                  .size([500, 500])
+                  .nodeId(function(d) {
+                      return d.pointNumber;
+                  })
+                  .nodes(data.nodes)
+                  .links(data.links);
+
+                graph = sankey();
+            });
+
+            it('creates a graph with circular links', function() {
+                expect(graph.nodes.length).toEqual(6, 'there are 6 nodes');
+                var circularLinks = graph.links.filter(function(link) {
+                    return link.circular;
+                });
+                expect(circularLinks.length).toEqual(2, 'there are two circular links');
+            });
+
+            it('keep a list of nodes with positions in integer (depth, height)', function() {
+                checkArray(graph.nodes, 'depth', [0, 0, 2, 3, 1, 1]);
+                checkArray(graph.nodes, 'height', [1, 3, 1, 0, 2, 0]);
+            });
+
+            it('keep a list of nodes with positions in x and y', function() {
+                checkRoundedArray(graph.nodes, 'x0', [72, 72, 267, 365, 169, 169]);
+                checkRoundedArray(graph.nodes, 'y0', [303, 86, 72, 109, 86, 359]);
+            });
+
+            it('supports column reordering', function() {
+                var reorder = [ 2, 2, 1, 1, 0, 0 ];
+
+                checkArray(graph.nodes, 'column', [0, 0, 2, 3, 1, 1]);
+
+                var a = graph.nodes[0].x0;
+                sankey.nodeAlign(function(node) {
+                    return reorder[node.pointNumber];
+                });
+                graph = sankey();
+                checkArray(graph.nodes, 'column', [2, 2, 1, 1, 0, 0]);
+                checkArray(graph.nodes, 'height', [1, 3, 1, 0, 2, 0]);
+                var b = graph.nodes[0].x0;
+                expect(a).not.toEqual(b);
+            });
+
+            it('updates links vertical position and circularLinkType upon moving nodes', function() {
+                var linkIndex = 6;
+                var nodeIndex = 2;
+                var delta = [0, 400];
+
+                var link = graph.links[linkIndex];
+                var linkY1 = link.y1;
+                var node = graph.nodes[nodeIndex];
+                var offsetTopToBottom = (node.y1 - node.y0) * link.value / node.value;
+
+                // Start with a circular link on top
+                expect(link.circular).toBeTruthy();
+                expect(link.circularLinkType).toEqual('top');
+
+                // Update graph
+                var updatedGraph = moveNode(sankey, graph, nodeIndex, delta);
+                var updatedLink = updatedGraph.links[linkIndex];
+
+                // End up with a cirular link on bottom
+                expect(updatedLink.circular).toBeTruthy();
+                expect(updatedLink.circularLinkType).toEqual('bottom');
+                expect(updatedLink.y1).toBeCloseTo(linkY1 + delta[1] + offsetTopToBottom, 0);
+            });
+        });
+
+        describe('handles large number of links', function() {
+            function _calc(trace) {
+                var gd = { data: [trace] };
+
+                supplyAllDefaults(gd);
+                var fullTrace = gd._fullData[0];
+                return Sankey.calc(gd, fullTrace);
+            }
+
+            beforeEach(function() {
+                data = _calc(mockCircularLarge.data[0]);
+                data = {
+                    nodes: data[0]._nodes,
+                    links: data[0]._links
+                };
+                sankey = d3SankeyCircular
+                  .sankeyCircular()
+                  .iterations(32)
+                  .nodePadding(10)
+                  .size([500, 500])
+                  .nodeId(function(d) {
+                      return d.pointNumber;
+                  })
+                  .nodes(data.nodes)
+                  .links(data.links);
+
+                graph = sankey();
+            });
+
+            it('creates a graph with circular links', function() {
+                expect(graph.nodes.length).toEqual(26, 'right number of nodes');
+                var circularLinks = graph.links.filter(function(link) {
+                    return link.circular;
+                });
+                expect(circularLinks.length).toEqual(89, 'right number of circular links');
+            });
+        });
+    });
+});