I appreciate everyones advice, though with regards to the river, it's unchangable at this point unfortunately. It's become involved in too many stories and whatnot, so I'm going to have to explain some features as manmade with lock gates or something if that will work.

Delgond:
I'd appreciate any help you can give me with mountains. I'm desperately trying to find a method that is easy to reproduce but that looks good. Mountains (and rolling hills) are the most difficult things I'm come across, even when I was using PSP.