Lake Manitoba, 4624 km2, elev 248 m, is one of 3 large lakes occupying the southern half of Manitoba. A narrow, irregular lake, about 200 km long with marshy shores, it is fed mainly from Lake WINNIPEGOSIS, which lies to the northwest, and drains northeast via the Dauphin River to Lake WINNIPEG.
Cedar Lake, 1353 km2, 62.5 km long, elev 253 m, is located in west-central Manitoba, north of Lake WINNIPEGOSIS. The lake draws most of its waters from the huge SASKATCHEWAN RIVER drainage basin. Construction of an earthfill dam and 25.6 km of dikes in 1961-64 caused lake levels to rise 3.
Lac Bienville, 1249 km2, elevation 426 m, maximum length 89 km, is located in a sparsely populated region of northern Québec. This elongated lake, dotted with numerous islands, is fed by Lacs Louet and Ossant. It drains west, via the Grande Rivière de la Baleine (Great Whale River), into Hudson Bay.