I think I was thinking too much.
I don't intend to map this ruin is here, this one there, castle of doom goes here.
But I do want the main population centers in place.
I have been playing around with the ZombiNirvana videos
I want a small like ,1kx1k miles area, that will be the burnt edge, rough sketch map of major things that is known to the players. no super detailed, but the dwarves are here, elves here, dont go here.
In reading all the responses I like the idea of huge evil and huge good going back and forth. Settlements dont spread out like on earth because its so dangerous. My largest current empire is is maybe 3x600 miles, most are 100 mile circles/blobs.