www.thesaurus.com is a good source of such words.
Either mug a seventh grader for his geography spiral, or try this . . .http://en.wikipedia.org/wiki/List_of_landforms:)- Ark
There are several good lists at:http://www.answers.com/topic/landscapes-and-seascapes-related-word-list The lists are sorted into these categories:Seascapes, Hills, Hollows, and Valleys, Plains and Marshes,Woods and Brush, Inland Waterways and LakesCoastal Land, Islands, and the Sea
I think you may want The Dictionary of Place-Names?
Oh dude, Biopunk, that is filled with so much win that I got win all over my shoes!- Ark
@Ark Yeah, it is pretty sweet. I couldn't remember the title and had to ask my dad if he remembered the name of it and he instantly got it: a cousin of his had the same name as the author...
Wow, ask and ye shall receive! Thanks for the aid, folks.