The Nelson River is a river of north-central North America, in the Canadian province of Manitoba. The river drains Lake Winnipeg and runs 644 kilometres (400 mi) before it ends in Hudson Bay. Its full length is 2,575 kilometres (1,600 mi), it has mean discharge of 2,370 cubic metres per second (84,000 cu ft/s), and has a drainage basin of 1,072,300 square kilometres (414,000 sq mi), of which 180,000 square kilometres (69,000 sq mi) is in the United States.

Winnipeg River is a Canadian river that flows roughly northwest from Lake of the Woods in the province of Ontario to Lake Winnipeg in Manitoba. This river is 235 kilometres (146 mi) long from the Norman Dam in Kenora to its mouth at Lake Winnipeg. Its watershed is 106,500 square kilometres (41,100 sq mi) in area, mainly in Canada. About 29,000 square kilometres (11,000 sq mi) of the watershed is in northern Minnesota, United States.