St. Lawrence River

The St. Lawrence River is a large river in the middle latitudes of North America. The St. Lawrence 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 provides the basis for the commercial St. Lawrence Seaway.

St. Lawrence River
Fleuve Saint-Laurent, Fleuve St-Laurent, St. Lawrence River
The St. Lawrence River in Montréal-Est, Quebec
Map of the St. Lawrence/Great Lakes Watershed
EtymologySaint Lawrence of Rome
Location
CountryCanada, United States
ProvincesOntario, Quebec
StateNew York
Physical characteristics
SourceLake Ontario
  locationKingston, Ontario / Cape Vincent, New York
  coordinates44°06′N 76°24′W
  elevation74.7 m (245 ft)
MouthGulf of St. Lawrence / Atlantic Ocean
  location
Quebec, Canada
  coordinates
49°30′N 64°30′W
  elevation
0 m (0 ft)
Length500 km (310 mi) excluding the estuary. C. 1200 km if included.
Basin size1,344,200 km2 (519,000 sq mi)[1]
Discharge 
  locationbelow the Saguenay River[2]
  average16,800 m3/s (590,000 cu ft/s)[2]