Musée du Bas-Saint-Laurent

Where the fresh and salt waters meet

Geographic map of the St. Lawrence Estuary (the Fluvial, Upper and Lower Estuary), its tributaries and main islands.

Design: Émilie Lapierre Pintal.

© Musée du Bas-Saint-Laurent.

The Estuary is what connects the Gulf of the St. Lawrence, which starts at Anticosti Island, with the St. Lawrence River itself, which starts at Québec. The fluvial estuary begins somewhere between Île d’Orléans and Île aux Coudres, as the tides start to be felt and fresh water mixes with salt water from the Atlantic Ocean.

This meeting of the fresh and saltwater is a fertile and rich natural environment. Its salt marshes and islands attract many sea birds, while its waters are filled with small crustaceans (zooplancton, gammarids, krill, etc.) on which sea mammals feed, particularly belugas, fin whales, blue whales and humpback whales. This is without counting the various seal and anadromous fish species that can live in both fresh and saltwater, like salmon and the brook trout (speckled trout) that live in these areas.

For humans, the Estuary is an indispensable means of transportation and commerce that links Canada’s cities to the Atlantic Ocean. It was also the backdrop to historic naval battles, shipwrecks, miraculous fishing and the arrival of thousands of immigrants.

Geographically speaking, the banks of the Estuary are a region squeezed between two mountainous areas: the Laurentians to the north and the Appalachians to the south. Fertile land is limited, which in turn limits the population in these areas. The first summer people liked the wild allure of the landscape, the mountains plunging into the river and the Saguenay River Fjord.

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