Is St. Lawrence River fresh or saltwater?

Lawrence River can be divided into three broad sections: the freshwater river, which extends from Lake Ontario to just outside the city of Quebec; the St. Lawrence estuary, which extends from Quebec to Anticosti Island; and the Gulf of St. Lawrence, which leads into the Atlantic Ocean.



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The St. Lawrence River begins as the outflow of the Great Lakes and widens into a large estuary near Ile d'Orléans, where the river's fresh water first encounters oceanic salt water and where the typical two-layer estuarine circulation begins.

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Between May and October, up to 13 species of cetaceans are found in the salty waters of the St. Lawrence, including blue whales, the largest animals on the planet, and impressive humpbacks, which swim up into the mouth of the Saguenay Fjord near Tadoussac to feed.

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