The Saint Louis River is a river in Minnesota that flows into Lake Superior. The largest river to flow into the lake, it is 179 miles (288 kilometers) in length and starts near Hoyt Lakes, Minnesota. The river's watershed is 3634 square miles (9412 km²) in area. Near the Twin Ports of Duluth, Minnesota and Superior, Wisconsin, the river becomes a freshwater estuary.
In the mid 20th century, the St. Louis River became one of the most heavily polluted waterways in the state. It became an Environmental Protection Agency Area of Concern. The river began to be cleaned up when a new wastewater treatment facility was completed in 1978 as part of the Western Lake Superior Sanitary District. Through the 1980s and 1990s, additional cleanups took place, and the river is now significantly less polluted.
The Saint Lawrence River (French: fleuve Saint-Laurent) is a large west-to-east flowing river in the middle latitudes of North America, connecting the Great Lakes with the Atlantic Ocean.
The Saint Lawrence River is born at the outflow of Lake Ontario at Kingston, Ontario.
The source of the North River in the Mesabi Range in Minnesota is considered to be the source of the Saint Lawrence River.
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