User blog comment:Nachtide/Open Slots for Broken Promises/@comment-2224454-20150402231605/@comment-2224454-20150403000744

Neither, really. West, for about 30 miles, are large, sloping hills, then about 20 miles of valley, and then 40 miles of mountains again, with a bunch of gaps and stuff that make them easy to pass, and they aren't super rocky or tall like the inner mountain range the clans are in, and then ten miles of sloping hills and then flatland towards the beach.

East is more tall, rocky, jagged snowy mountains that cats can't cross. And there's a giant uncrossable river, so if they cross the border or something, I'd recommend west side. There's a map of the immediate area around the clans on the Territories page.