Thanks for linking these - I'd seen them before, but hadn't caught the name of the book. I'll be picking it up :)

For what it's worth, my own experience says that the area for "Greater Appalachia" is pretty much 100% correct. The borders aren't quite sharp, and interesting things definitely happen where two or more "nations" meet.

I also know that West Virginia and middle Tennessee feel like "home" to me, and I'm from the Arkansas Ozarks.