Located between the towns of Sorel-Tracy and Trois-Rivières, Lake Saint-Pierre is the last broadening of the Saint Lawrence River before its estuary.

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Upstream on this magnificent fluvial lake is an archipelago made up of about a hundred islands, home to a wide variety of plants and animals.

In spite of surrounding industrial activity, this ecosystem has retained 90% of its natural pristine state.

Lake Saint-Pierre has an area of 480 km². The maximum water depth is less than 3 metres, except in the Seaway where water depth reaches 11.3 metres.

Spring flooding and the gentle slope of its shores increase its surface to 660 km².

It’s the largest important freshwater flood plain in Quebec.

Nearly 50 % of the wetland environments of the Saint Lawrence River are in Lake Saint-Pierre.

In 1998, Lake Saint-Pierre was designated as a RAMSAR site, a recognition of the worldwide importance of its wetlands.

In 2000, UNESCO conferred upon Lake Saint-Pierre the status of “World Biosphere Reserve” in order to recognize the quality of its natural environment and the efforts made to preserve this unique ecosystem. 

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