Are you familiar with the procedurally generated worlds in Dwarf Fortress (they have some similarity to your project)?
This is much simpler! Just hand-picked thresholds of some parameterized perlin noise.
Almost like a pristine world, still unsullied by the various races & evils that inhabit a usual DF map. Peaceful.
¹not really ASCII, ofc.
Are you familiar with the procedurally generated worlds in Dwarf Fortress (they have some similarity to your project)?