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
Puelo Lake Puelo Lake Lake Puelo () is a lake located in the northern part of Chubut Province, in Argentine Patagonia. Of fluvial-glacial origin, its deepest point is some 180 meters below the water level. The narrow L-shaped lake is surrounded by Lago Puelo National Park. The lake is fed by the small rivers, "Azul" and "Quemquemtreu". The outflow from Puelo Lake is the Puelo River which flows to the Pacific Ocean through Chile. The river emerges from the lake at the border with Chile, flows through a narrow turbulent passage called Arroyo los Hitos about long and into Lake Puelo Inferior