Trois-Rivières is a city in the Mauricie administrative region of Quebec, Canada, at the confluence of the Saint-Maurice and Saint Lawrence rivers, on the north shore of the Saint Lawrence River across from the city of Bécancour. It is part of the densely populated Quebec City–Windsor Corridor and is approximately halfway between Montreal and Quebec City. Trois-Rivières is the economic and cultural hub of the Mauricie region. The settlement was founded by French colonists on July 4, 1634, as the second permanent settlement in New France, after Quebec City in 1608.

The St. Lawrence River is a large international river in the middle latitudes of North America connecting the Great Lakes to the North Atlantic Ocean. Its waters flow in a northeasterly direction from Lake Ontario to the Gulf of St. Lawrence, traversing Ontario and Quebec in Canada and New York in the United States. A section of the river demarcates the Canada–U.S. border.