Gates of the Arctic National Park and Preserve

Gates of the Arctic lies entirely above the Arctic Circle in northern Alaska and has no roads, trails, or visitor facilities within its boundaries — entry is exclusively by small aircraft or on foot from the Dalton Highway. The park protects the central Brooks Range, a north-south trending mountain chain that forms the continental divide between Arctic and Pacific drainages in Alaska. River valleys within the park see large caribou migrations twice a year and support wolves, grizzly bears, and Dall sheep in near-complete wilderness conditions.