Gulf of St. Lawrence
Gulf of St. Lawrence
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Gulf of St. Lawrence

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Gulf of St. Lawrence

The Gulf of St. Lawrence is a gulf that fringes the shores of the provinces of Quebec, New Brunswick, Nova Scotia, Prince Edward Island, Newfoundland and Labrador, in Canada, plus the islands Saint-Pierre and Miquelon, possessions of France, in North America.

The Gulf of St. Lawrence connects the Great Lakes to the Atlantic Ocean via the St. Lawrence River.

The Gulf of St. Lawrence is bounded on the north by the Labrador Peninsula and Quebec, on the east by Saint-Pierre and Newfoundland, on the south by the Nova Scotia peninsula and Cape Breton Island, and on the west by the Gaspé Peninsula, New Brunswick, and Quebec. The Gulf of St. Lawrence contains numerous islands, including Anticosti, Prince Edward, Saint Pierre, Cape Breton, Miquelon-Langlade, and the Îles-de-la-Madeleine archipelago.

Half of Canada's ten provinces adjoin the Gulf: New Brunswick, Nova Scotia, Prince Edward Island, Newfoundland and Labrador, and Quebec.

There is no consensus on the demarcation of the St Lawrence River from the Gulf, nor whether it is hydrographically a gulf or an estuary.

According to Commission of Toponymy Quebec, the St. Lawrence River becomes the gulf at Pointe des Monts on the Côte-Nord and Matane Bas-Saint-Laurent or Sainte-Anne-des-Monts La Haute-Gaspésie, the Estuary is upstream, the Gulf of St. Lawrence, much wider, downstream.

The International Hydrographic Organization defines the gulf's extent as follows:

At Baie-Trinité, the Pointe-des-Monts Lighthouse, a National historic site of Canada, was built in 1829–1830 on a point that geographers throughout history, since as early as Samuel de Champlain (1567–1655), have classified as the demarcation point between the St. Lawrence River and the Gulf of St. Lawrence.

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