`terrain.border_falloff`Island shape

Default: 800

What it does

Sets how wide the strip of coast is where land sinks down into the ocean at the map edge. The default 800 is roughly a 400 m fade.

What you see

Raise it and the island shrinks behind a long gentle shelf sloping into the sea, lower it and land pushes almost to the map border then cuts off.

Gotcha

Raising it makes the island SMALLER (the fade starts further in), not just softer. Exactly 0 removes the border entirely.

See it on a real map

Reference seed 12345, size 4500. “Try live” opens the generator with the value applied.

default 800

200 — cliff-like abrupt island edge try live →

3200 — smaller island, huge shelf try live →

0 — no border — land everywhere try live →