Mackenzie River east into the Churchill River. The eastern portion of the Mackenzie basin is dominated by vast reaches of lake-studded boreal forest and includes many of the largest lakes in North America. By both volume and surface area, Great Bear Lake is the biggest in the watershed and third largest on the continent, with a surface area of and a volume of . Great Slave Lake is slightly smaller, with an area of and containing of water, although it is significantly deeper than Great Bear. The third major lake, Athabasca, is less than a third that size with an area of
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