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Saint Lawrence River

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Coordinates: 49°30′N 64°30′W / 49.5°N 64.5°W / 49.5; -64.5
Saint Lawrence River
Fleuve Saint-Laurent
Saint Lawrence seaway.jpg
St. Lawrence River near Alexandria Bay
Countries Canada, United States
State/Provinces Ontario, Quebec, New York
Source Lake Ontario
 - location Kingston, Ontario / Cape Vincent, New York
 - elevation 74.7 m (245 ft)
 - coordinates 44°06′N 76°24′W / 44.1°N 76.4°W / 44.1; -76.4
Mouth Gulf of Saint Lawrence / Atlantic Ocean
 - elevation m (0 ft)
 - coordinates 49°30′N 64°30′W / 49.5°N 64.5°W / 49.5; -64.5
Length 1,197 km (744 mi)
Basin 1,344,200 km² (519,000 sq mi) [1]
Discharge for below the Saguenay River
 - average 16,800 /s (590,000 cu ft/s) [2]
Map of the St. Lawrence/Great Lakes Watershed
Map of the St. Lawrence/Great Lakes Watershed

The Saint Lawrence River (French: fleuve Saint-Laurent; Tuscarora: Kahnawáʼkye;[3] Mohawk: Kaniatarowanenneh, meaning "big waterway") is a big river in eastern North America. It flows between the Canadian province of Ontario and the American state of New York, and through the Canadian province of Quebec.

The river drains water from the Great Lakes into the Atlantic Ocean. It is more than three thousand kilometres long. The river meets the Atlantic Ocean in a big "estuary" or bay, the biggest in the world; this is called the Gulf of Saint Lawrence.

The Canadian cities of Kingston, Montreal, Trois-Rivières and Quebec City are on this river. It is very important because ships can sail up the river and through the Great Lakes right into the middle of North America. It is the third largest river in Canada.


  1. Natural Resources Canada, Atlas of Canada - Rivers
  2. Benke, Arthur C.; Cushing, Colbert E. (2005). Rivers of North America. Academic Press. pp. 989–990. ISBN 978-0-12-088253-3 . Retrieved 21 March 2011.
  3. Rudes, B. Tuscarora English Dictionary Toronto: University of Toronto Press, 1999

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