L Winnipeg y large (24,514 ² (9,465 q )) central North America, province Manitoba, Canada, about 55 kilometres (34 ) north y Winnipeg. I largest within borders southern Canada, p undeveloped pristine large watershed southern Canada.

I fifth-largest freshwater Canada, relatively shallow ( depth 12 (39 ) excluding narrow 36 (118 ) p channel between northern southern basins. I eleventh-largest freshwater Earth. T pristine boreal forests rivers being promoted potential United Nations World Heritage P. T elongated shape, 416 kilometres (258 ) north south, remote sandy beaches, large limestone cliffs, y caves areas. Manitoba Hydro largest reservoirs world. There y islands lake, undeveloped pristine.

T lake's watershed measures about 984,200 square kilometres (380,001.7 q ), covers Alberta, Saskatchewan, Manitoba, northwestern Ontario, Minnesota, North Dakota. S tributaries include:

- Saskatchewan River (through Cedar L),

- R River (draining Assiniboine River),

- Winnipeg River (draining L Woods, Rainy River Rainy L);

- L Manitoba (draining L Winnipegosis),

- Bloodvein River ( E side, draining Canadian Shield)

- Poplar River

- Manigatogan River

L Winnipeg drains northward Nelson River average annual 2,066 cubic metres p second (72,960 /), forms p Hudson By watershed, which largest world. T watershed historically known Rupert's L Hudson's By Company formed 1670.