Mackenzie River great depths to bedrock. A characteristic feature of the delta is its numerous pingos, or hills of earth-covered-ice – some 1,400 of them. The Peel River, carrying much of the runoff from the northern Yukon, joins in the delta at a point northeast of Fort McPherson. Below there, the Mackenzie diverges into several large channels with the largest heading north-northeast, emptying into the Beaufort Sea west of Tuktoyaktuk. At , the Mackenzie River drainage basin encompasses nearly 20 percent of Canada. About , or 54 percent of the basin, lies above Great Slave Lake. Permafrost underlies about three-quarters of the
Whitefish River (Northwest Territories) Whitefish River (Northwest Territories) The Whitefish River is a river in the Deline District, Sahtu Region, Northwest Territories, Canada. It is in the Arctic Ocean and Mackenzie River drainage basins, is a tributary of Great Bear Lake and has a watershed of . The river begins at an unnamed lake and flows west then southwest to the west side Man Drowned Himself Lake. It exits the lake at the south, takes in the unnamed left tributary arriving from Kekwinatui Lake, and heads southwest, west and northwest. It passes Whitefish River Airfield on the left bank of the river valley, and