terrain.fade_mountainElevation
What it does
How reluctant mountains are to reach full height. The default 2.75 keeps them deliberately tame, most maps never show mountains at full power. Lower it and the mountains are unleashed across far more of the map.
What you seeLower it and dramatic ridged peaks erupt across the interior, raise it and mountains flatten into vague highlands.
Gotcha
0 switches mountains off entirely. Going very low (around 1 or less) makes peaks so tall they hit the game's height ceiling and wrap around — you get weird pockets of “deep ocean” on the summits (see the quirks page).
See it on a real map
Reference seed 12345, size 4500. “Try live” opens the generator with the value applied.