i forgot exactly what they said, but theyve brought it up, it was in one of those slow ass episodes early in season 2. they said basically what i said, except maybe they didnt say anyhthing about fences. they definitely said it was swamp though and hard to navigate land. like when darrel was out there on horse back, those big ass hills and shit, like that one big ass hill he fell down and landed in all that water. i just picture the whole land being kinda like that, plus thick ass muddy swamp. then i think they said something about the zombies wouldnt be stuck out there forever, they'll get in eventually or something