https://www.rpglibrary.org/software/...map_generator/ Perhaps you've seen this in the list of mapping software
thread. I'm currently going to try it in an attempt at another Neverwinter Nights2 PW setup for my cities and towns, I've got an idea to use the ability to set colors of it's elements to start the basic height map. But irregardless, I think it's a nifty little program that might give you a headstart too.