Uh... yeah? To both questions. I mean, I can't really say if there are actual villages full of only earthbenders, but the Earth Kingdom's pretty huge, so there are enough of us out there to fill a town out without a lot of trouble. And the world's definitely mapped out! The Spirit World isn't so much, but...

[ ....... W E L P ]

Well, either way, it'd be nice to pass on the slavery. So. I guess I don't really know how moving a whole island all the time might work out, anyway. Especially not on another world.