Winnipegosis, Lake (wĭnˌĭpəgōˈsĭs) [key], 2,086 sq mi (5,403 sq km), 125 mi (201 km) long and 25 mi (40 km) wide, W Man., Canada. It is a remnant of glacial Lake Agassiz. It drains SE into Lake Manitoba and thence into Lake Winnipeg. Lake Winnipegosis has important pike fisheries.
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