Yukon Plateau

a plateau in the northwestern part of North America. The Yukon Plateau, which occupies much of Alaska’s interior and the northwestern part of Canada, borders on the Brooks Range in the north, the Alaska Range and St. Elias Mountains in the south, the Mackenzie Mountains in the east, and the Bering and Chukchi seas in the west. It consists of large massifs that are separated by tectonic troughs. The mountains, which are deeply dissected by rivers, rise to elevations of 1,500–2,000 m; in the west, the floors of the intermontane basins are situated at elevations not exceeding 200 m, and in the southeast, at elevations not exceeding 500 m.