Saint Lawrence River

Saint Lawrence River is the artery of Saint Lawrence Water System which is one of the largest in the world. This river measures 1,197 kilometers in length. It starts at the outflow of Lake Ontario and passes through several towns and cities in Quebec and Ontario and eventually empties into the Gulf of Saint Lawrence.

It is also the world’s largest estuary. The drainage basin of this river covers approximately 1 million square kilometers. Major tributaries include the Ottawa River, the Saguenay River, the Manicouagan River, the St-Maurice River and the Richelieu River.


Quick Facts: –

  • Saint Lawrence River is an important source of hydroelectric power. It is home to the Beauharnois power plant, one of the world’s largest facilities.
  • Saint Lawrence Water System is responsible for draining more than a quarter of the Earth’s freshwater reserves.
  • It has a discharge rate of 347, 849 cubic feet of water per second.
  • The deepest point of the river is at 250 feet.
  • A section of the river from Kingston to Montreal is known as International Rapids because a series of rapids is created by sudden drops in river beds.
  • It is the most important commercial waterway in Canada, as well as a source of electric power.
  • Saint Lawrence River connects the Great Lakes to the Atlantic Ocean.
  • It flows close to the border between the United States and Canada. Canada is to the north and the US is to the south of the river.
  • This river includes several lakes such as Saint-Louis, Saint Francis, and Saint Pierre Lakes.
  • The water river water is considered suitable for domestic use and still supports hundreds of households in the area.