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
North River (Belmont Lake) which flows via the Trent River to Lake Ontario. North River (Belmont Lake) The North River is a river in the municipality of Havelock-Belmont-Methuen, Peterborough County in Central Ontario, Canada. It is part of the Great Lakes Basin, and is a right tributary of the Crowe River. The river begins at Imp Lake in geographic Methuen Township and flows south, past the Blue Mountain Mine at Devil's Lake, to Kasshabog Lake. It continues south to Long Lake, then turns east, then resumes a southward direction, and enters geographic Belmont Township. The river passes through Round Lake, turns east, and reaches