diff --git a/island.ts b/island.ts
index 3bb9c40..86d7c29 100644
--- a/island.ts
+++ b/island.ts
@@ -147,7 +147,8 @@ class IslandGrid {
     this.dropWithin(beachTiles);
 
     // expand forest
-    const forestTiles = lowlandTiles1.filter((pos) => this.data[pos] == 2);
+    const forestLobe = this.floodSearch(this.lobePos1, (tile) => tile > 1);
+    const forestTiles = forestLobe.filter((pos) => this.data[pos] == 2);
     this.dropWithin(forestTiles);
     this.dropWithin(forestTiles);
     this.dropWithin(forestTiles);