diff --git a/src/layers/renderers/drawBiomes.js b/src/layers/renderers/drawBiomes.js
index e1d7424f..91856940 100644
--- a/src/layers/renderers/drawBiomes.js
+++ b/src/layers/renderers/drawBiomes.js
@@ -18,10 +18,7 @@ export function drawBiomes() {
     const edgeVerticle = cells.v[i].find(v => vertices.c[v].some(i => cells.biome[i] !== b));
     const chain = connectVertices(edgeVerticle, b);
     if (chain.length < 3) continue;
-    const points = clipPoly(
-      chain.map(v => vertices.p[v]),
-      1
-    );
+    const points = clipPoly(chain.map(v => vertices.p[v]));
     paths[b] += "M" + points.join("L") + "Z";
   }
 
diff --git a/src/modules/coastline.js b/src/modules/coastline.js
index da1d0af2..d801ba38 100644
--- a/src/modules/coastline.js
+++ b/src/modules/coastline.js
@@ -37,10 +37,7 @@ export function drawCoastline() {
     let vchain = connectVertices(start, type);
     if (features[f].type === "lake") relax(vchain, 1.2);
     used[f] = 1;
-    let points = clipPoly(
-      vchain.map(v => vertices.p[v]),
-      1
-    );
+    let points = clipPoly(vchain.map(v => vertices.p[v]));
     const area = d3.polygonArea(points); // area with lakes/islands
     if (area > 0 && features[f].type === "lake") {
       points = points.reverse();
diff --git a/src/modules/ocean-layers.js b/src/modules/ocean-layers.js
index de8f207b..4cbe79db 100644
--- a/src/modules/ocean-layers.js
+++ b/src/modules/ocean-layers.js
@@ -34,10 +34,7 @@ window.OceanLayers = (function () {
       const relax = 1 + t * -2; // select only n-th point
       const relaxed = chain.filter((v, i) => !(i % relax) || vertices.c[v].some(c => c >= pointsN));
       if (relaxed.length < 4) continue;
-      const points = clipPoly(
-        relaxed.map(v => vertices.p[v]),
-        1
-      );
+      const points = clipPoly(relaxed.map(v => vertices.p[v]));
       chains.push([t, points]);
     }
 
diff --git a/src/modules/ui/coastline-editor.js b/src/modules/ui/coastline-editor.js
index b91dbb72..6dc4215b 100644
--- a/src/modules/ui/coastline-editor.js
+++ b/src/modules/ui/coastline-editor.js
@@ -90,10 +90,7 @@ export function editCoastline(node = d3.event.target) {
   function redrawCoastline() {
     const f = +elSelected.attr("data-f");
     const vertices = pack.features[f].vertices;
-    const points = clipPoly(
-      vertices.map(v => pack.vertices.p[v]),
-      1
-    );
+    const points = clipPoly(vertices.map(v => pack.vertices.p[v]));
     const d = round(lineGen(points));
     elSelected.attr("d", d);
     defs.select("mask#land > path#land_" + f).attr("d", d); // update land mask
diff --git a/src/types/modules.d.ts b/src/types/modules.d.ts
index bfe96291..6bfd06da 100644
--- a/src/types/modules.d.ts
+++ b/src/types/modules.d.ts
@@ -1,4 +1,4 @@
 declare module "lineclip" {
-  export function polygon(points: number[][], bbox: number[], result?: number[][]): number[][];
-  export function lineclip(points: number[][], bbox: number[]): number[][];
+  export function polygon(points: number[][], bbox: number[]): number[][];
+  export function lineclip(points: number[][], bbox: number[], result: number[][]): number[][];
 }
diff --git a/src/utils/lineUtils.ts b/src/utils/lineUtils.ts
index d6ff2b2e..d118e496 100644
--- a/src/utils/lineUtils.ts
+++ b/src/utils/lineUtils.ts
@@ -2,7 +2,7 @@ import {polygon} from "lineclip";
 
 // clip polygon by graph bbox
 export function clipPoly(points: TPoints) {
-  return polygon(points, [0, 0, graphWidth, graphWidth]);
+  return polygon(points, [0, 0, graphWidth, graphHeight]);
 }
 
 // get segment of any point on polyline