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
Cass River (Mackenzie District) Cass, Chief Surveyor of Canterbury Province from 1851 to 1867. Cass River (Mackenzie District) The Cass River is an alpine river in the Canterbury Region of the South Island of New Zealand. It rises in the Hall Range immediately below Rankin Pass, and also receives water from the nearby Huxley Glacier. After dropping very rabidly the river flows south with braided channels along a flat-bottomed valley for . The Leibig Range and Gamack Range are to the west, and the Haszard Range to the east. The river flows into the west side of Lake Tekapo where it has built up