what about the mountains

[Trin]

If one sees you, it will chase you pretty much forever, unless other food comes along to distract it. It doesn't need rest, and could give a damn about "inhospitable terrain". If you can get there, a zombie can get there. It's not like they're in cars, and need to stick to the road. And if another sees it roaming out into the countryside, it will follow. And another that sees that one. And on and on. Next thing you know, you've got a gang heading out to your "safe" area. Zombies only pursue so long as they know where to go. I think this is evidenced by Fiddler's Green not having a horde of straggling zombies roaming up after every scavenging run. They may follow for a time, but a few turns in the road and they're off the trail. And if a few stragglers randomly wander their way to your base, well that's what rifles and guards are for. As for not being stopped by inhospitable terrain, of course they'd be stopped. A ditch and drawbridge sealing off the only road would be enough to stop a thousand zombies, or at least give you time to dispatch them as they funneled in.

[krakenslayer]

yeah, obviously they'd be stopped by inhospitable terrain - we can climb over boulders, carefully pick our way across swamps, cut through dense vegetation, etc. A zombie is so coordinated that it can't even use an escalator.

[04]

if the mts were to channelize the zombies to a place then couldnt you channel them off a cliff or into a tar pit or some other type of trap that would either kill them out right or maybe fall into a river and just get washed away