Why Are There So Many Big Walls in Fantasy Novels?

Image source http://gameofthrones.wikia.com/wiki/The_Wall I’ve just started reading Sabriel by Garth Nix. I’m not far into it enough to comment on the story’s overall quality, but I came across something early on. The land is divided. By a big-ass wall. Separating the north from the south. And now I’m finally asking somebody to explain to me: … Continue reading Why Are There So Many Big Walls in Fantasy Novels?