terrain.noise_mountainRegional detail
What it does
The actual mountain ranges, long winding ridge lines that can appear anywhere on the map (except the low-loot side, where the game blocks them). Mountains don't pile on top of hills: where they're taller, they take over completely.
What you seeLong snaking mountain chains that swallow the surrounding hills; raising amp makes them taller and lets them claim more territory. amp=0 caps the whole map at hill height.
See it on a real map
Reference seed 12345, size 4500. “Try live” opens the generator with the value applied.
default oct=8,freq=1,amp=0.07,offset=0
amp=0 — no mountains at all try live →
amp=0.15 — safe-ish peaks try live →
amp=0.5 — past Y-level 500 try live →