Winnipeg River is part of the Saskatchewan-Nelson river system that empties into Hudson Bay. The Winnipeg is 140 miles (225 kilometers) long. It rises in western Ontario and winds west, draining the Lake of the Woods. It empties into Lake Winnipeg, near the city of Winnipeg. Hydroelectric generating stations on the river supply some of Winnipeg’s power. In pioneer days, the Winnipeg River was on the fur-trade route to the Northwest.