Location from Divergent by Veronica Roth
The electrified barrier encircling Chicago — Dauntless guards it against threats from outside, never knowing that the real threat is the people on the other side watching them through cameras.
The Fence is the edge of the known world for most Chicago residents. Dauntless patrols guard it, told they're protecting the city from external threats — but the threats are never specified, and no one from outside ever comes. The official story is that the world beyond the fence is too dangerous. The truth is that the Bureau of Genetic Welfare built the fence to contain the experiment, not protect it. The marshland beyond the fence feels wrong — too quiet, too empty, stretching into a blur of green and grey. The few people who've crossed it found the Bureau's compound. The fence isn't a barrier against the world. It's a cage.
A massive chain-link and concrete barrier topped with razor wire, running the entire perimeter of the city. Guard towers at regular intervals, staffed by Dauntless. Floodlights sweep the marshy ground beyond. The fence hums with electricity. Beyond it: overgrown highways, swampy terrain, and the decayed ruins of suburban Chicago stretching into wilderness.
Also known as: The Fence, The Perimeter