Lake Winnipegosis is a large (5,370 km2) lake in central North America, in Manitoba, Canada, some 300 km northwest of Winnipeg. It is Canada's eleventh-largest lake.

Manitoba is a province of Canada at the longitudinal centre of the country. It is Canada's fifth-most populous province, with a population of 1,342,153 as of 2021. Manitoba has a widely varied landscape, from arctic tundra and the Hudson Bay coastline in the north to dense boreal forest, large freshwater lakes, and prairie grassland in the central and southern regions.