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St. Lawrence Valley

Saint Lawrence River
Fleuve Saint-Laurent
Saint Lawrence seaway.jpg
St. Lawrence River near Alexandria Bay
Name origin: Saint Lawrence of Rome
Countries Canada, United States
Provinces Ontario, Quebec
State 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 / 44.100°N 76.400°W / 44.100; -76.400
Mouth Gulf of St. Lawrence / Atlantic Ocean
 - elevation 0 m (0 ft)
 - coordinates 49°30′N 64°30′W / 49.500°N 64.500°W / 49.500; -64.500Coordinates: 49°30′N 64°30′W / 49.500°N 64.500°W / 49.500; -64.500
Length 1,197 km (744 mi)
Basin 1,344,200 km2 (519,000 sq mi)
Discharge for below the Saguenay River
 - average 16,800 m3/s (590,000 cu ft/s)
Grlakes lawrence map.png
Map of the St. Lawrence/Great Lakes Watershed

The Saint Lawrence River (French: Fleuve Saint-Laurent; Tuscarora: Kahnawáʼkye;Mohawk: Kaniatarowanenneh, meaning "big waterway") is a large river in the middle latitudes of North America. The Saint Lawrence River flows in a roughly north-easterly direction, connecting the Great Lakes with the Atlantic Ocean and forming the primary drainage outflow of the Great Lakes Basin. It traverses the Canadian provinces of Quebec and Ontario, and is part of the international boundary between Ontario, Canada, and the U.S. state of New York. This river also provides the basis of the commercial Saint Lawrence Seaway.

The St. Lawrence River begins at the outflow of Lake Ontario and flows through Gananoque, Brockville, Morristown, Ogdensburg, Massena, Cornwall, Montreal, Trois-Rivières, and Quebec City before draining into the Gulf of Saint Lawrence, the largest estuary in the world. The estuary begins at the eastern tip of Île d'Orléans, just downstream from Quebec City. The river becomes tidal around Quebec City.


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