Rivière Saint-Maurice, 563 km long, rises upstream from Réservoir Gouin, 200 km west of Lac Saint-Jean, Québec. It drains a basin of 43 300 km2. After its confluence with Rivière Manouane, it feeds Réservoir Blanc and then takes in the Vermillon, Trenche, Croche, Mattawin and Mékinac rivers.
The Detroit River, 52 km long, flows south from Lake ST CLAIR to the west end of Lake ERIE, forming part of the boundary between Ontario and Michigan. Detroit, Michigan, and WINDSOR, Ontario, dominate its shores. Part of the ST LAWRENCE SEAWAY, it is heavily used by commercial traffic.
The Fraser River is the longest river in British Columbia, stretching 1,375 km. It begins on the western side of the Rocky Mountains at Mount Robson Provincial Park, and ends in the Strait of Georgia at Vancouver. Named for explorer Simon Fraser, the river was a transportation route and source of food for the Indigenous people of the region long before Fraser travelled its waters. In 1858, gold was discovered on sandbars south of Yale, setting off the Fraser River Gold rush.2
Attawapiskat River, 748 km long, formed by the confluence of the Pineimuta, Trading and Otoskwin rivers at Attawapiskat Lake, in northeastern Ontario, flows east, jogs north and runs east to the flatland by James Bay. Its drainage area is 50 200 km2 and its mean discharge 626 m3/s.
Churchill River, Labrador, 856 km long (to head of Ashuanipi River), issues from Ashuanipi Lake, drops 75 m over Churchill Falls, broadens into Winokapau Lake and runs east through a deep glacial gorge past Happy Valley-Goose Bay into Lake Melville, Hamilton Inlet, entering the Atlantic near Rigolet (pop 317).