Mackenzie River Mackenzie River The Mackenzie River (Slavey language: Deh-Cho , "big river" or Inuvialuktun: Kuukpak , "great river"; ) is the longest river system in Canada, and has the second largest drainage basin of any North American river after the Mississippi River. The Mackenzie River flows through a vast, thinly populated region of forest and tundra entirely within the Canadian Northwest Territories, although its many tributaries reach into four other Canadian provinces and territories. The river's main stem is long, flowing north-northwest from Great Slave Lake into the Arctic Ocean, where it forms a large delta at its mouth. Its extensive
Black Lake (Fond du Lac River, Saskatchewan) Black Lake (Fond du Lac River, Saskatchewan) Black Lake is a lake in the Mackenzie River drainage basin in northern Saskatchewan, Canada. It is about long, wide, has an area of , and lies at an elevation of . The primary inflows are the Chipman River, Cree River, Fond du Lac River, and Souter River; the primary outflow is Fond du Lac River, which flows via the Mackenzie River into the Arctic Ocean. The community of Black Lake is located on the northwest shore of the lake, near where the Fond du Lac River exits. The fish species in the