Gulf of Saint Lawrence

The St. Lawrence Gulf ( Gulf of Saint Lawrence English, French Golfe du Saint -Laurent ) is located at the outlet of the Saint Lawrence River into the Atlantic Ocean and is the largest estuary of the earth.

It is bordered by the Labrador Peninsula in the north, Newfoundland in the northeast, southwest of the Gaspé Peninsula and in southern New Brunswick, Nova Scotia and Cape Breton Island.

In the West, one might delimit the St. Lawrence Gulf from the estuary of the St. Lawrence river on its narrowing east of Matane.


With the Atlantic Ocean to the Gulf is still connected via two straits:

  • Belle -Isle Strait - between Labrador Peninsula and Newfoundland
  • Cabot Strait - between Newfoundland and Cape Breton Iceland
  • Strait of Canso - between Cape Breton and Nova Scotia Iceland, 1 km wide. After completion of the Canso Causeway in 1955, no free water exchange more between the Gulf and the Atlantic at this point takes place.


  • Québec Magdalen Islands
  • Anticosti
  • Newfoundland
  • Cape Breton Island
  • Prince Edward Iceland


  • Chaleur Bay