Lake Manitoba is Canada's thirteenth largest lake (4,624 km2) and the World's 33rd largest freshwater lake. It is in central North America, in the Canadian province of Manitoba, which is named after the lake. It is located about 75 km northwest of the province's capital, Winnipeg. The lake, its shores populated by the Assiniboine and Cree, was made known to Europeans by La Vérendrye in the mid-1730s.
The irregularly shaped lake, about 200 km long, is the smallest of a group of three large lakes, the other two being Lake Winnipeg (the largest) and Lake Winnipegosis, which are found on the floor of the prehistoric Glacial Lake Agassiz. The lake is subdivided into two connected but distinctly different basins: a small, irregular-shaped north basin and a much larger south basin. It is part of the watershed of the Nelson River and Hudson Bay.
Lake Manitoba is one of the three main lakes in Manitoba's $30-million annual commercial fishing industry. The main marketable fish species caught on Lake Manitoba has changed from whitefish in the late 19th century to walleye, sauger and yellow perch today. There has been a large increase in rough fish like carp and mullet. Tulibee catch remains high, although it is not considered a commercial species.