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
Mackenzie River (electoral district) meridian in the system of Dominion Land surveys, and on the north by the continental shore of the Arctic Ocean. Mackenzie River (electoral district) Mackenzie River was a federal electoral district in Northwest Territories, Canada, that was represented in the House of Commons of Canada from 1953 to 1963. This riding was created in 1952 when Yukon—Mackenzie River riding was split into two. The parts within the Northwest Territories became Mackenzie River riding. It was abolished in 1962 when it was merged into Northwest Territories riding. It consisted the Provisional District of Mackenzie bounded on the west by the Yukon