diff --git a/island.ts b/island.ts
index 8a63a9e..8b92343 100644
--- a/island.ts
+++ b/island.ts
@@ -166,9 +166,25 @@ export function IslandApplet() {
   function tick() {
     const islandTiles = islands.floodSearch(basePos, (tile) => tile > 0);
     dropWithin(islandTiles);
-    dropWithin(islandTiles);
 
-    const mountainTiles = islands.floodSearch(basePos - 8, (tile) => tile > 4);
+    // focus shore
+    dropWithin(islandTiles.filter((pos) => islands.data[pos] == 0));
+
+    // form forest
+    const hill = islands
+      .floodSearch(basePos + 12, (tile) => tile >= 2)
+      .filter((pos) => islands.data[pos] == 2);
+    dropWithin(hill);
+
+    // grow forest
+    const forestTiles = islandTiles.filter(
+      (pos) => islands.data[pos] >= 2 && islands.data[pos] <= 3
+    );
+    dropWithin(forestTiles);
+    dropWithin(forestTiles);
+
+    // form mountain
+    const mountainTiles = islands.floodSearch(basePos - 12, (tile) => tile > 4);
     dropWithin(mountainTiles);
 
     // const erodePos = islandTiles[islands.rng() % islandTiles.length];