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St. Lawrence Estuary

Where the Saint-Lawrence Estuary meets the Saguenay Fjord, it starts to widen from less than 10 nautical miles (just under 20 km) to more than 50 (93 km) between the Gaspé Peninsula and the North Shore, where it flows into the Gulf of St. Lawrence. This is the largest estuary in the world!

Cold waters and a rich habitat

The Saint-Lawrence Estuary hosts a wide variety of wildlife, ranging in size from the tiniest known living species to the largest animal on earth, the blue whale. The very deep waters at the confluence of the Saguenay Fjord and the St-Lawrence are the coldest south of the Belle Isle Straight, and the fish that thrive there attract whale populations every summer. Most whales migrate back and forth through the Gulf.


Tides, currents, maritime traffic, lights, lighthouses, buoys and fog combine to create conditions conducive to the instruction of Intermediate and Advanced Cruising courses, while whales, seals, islands and tidal flats express the beauty of this body of water.

In the estuary, from the tip of Île d’Orléans down to Cap-Chat, the St. Lawrence River’s fresh water becomes increasingly salty as it mixes with the waters of the Atlantic Ocean.You are invited on a discovery tour of the St. Lawrence estuary, through Cap-à-l’Aigle, the Pot à l'Eau-de-Vie (Brandy Pot) islands, the Toupie, Tadoussac, the Bic islands and many other fabulous landscapes of the region.

National Park

The Saguenay–St. Lawrence Marine Park extends from St-Fidèle to Les Escoumins, on either side of the Saguenay Fjord, along the north shore of the estuary, in addition to covering most of the fjord. Its main role is to enhance the level of protection of the area’s ecosystems.