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The Saint Charles River (in French: rivière Saint-Charles) is a branch of the St. Lawrence River that starts in Salaberry-de-Valleyfield, Quebec. The river divides the Grande-Île and the Island of Salaberry, which are located approximately 50km east of Montreal. The river is __m long, and drops 24m over its course from Lac Saint François east to Lake Saint Louis.

The Rivière Saint-Charles is not a distinct river unto itself, it is in reality an arm of the Saint Lawrence River. The river originates at the end of Lac Saint-François at Salaberry-de-Valleyfield and passes through the town of Saint-Timothée, before entering Lac Saint-Louis to the east. The river drops 24 metres over its length. Originally, at the western end of Lac Saint-François, there were two channels, the Channel to the North and the rivière Saint-Charles. Because of the presence of rapids, several canals have been built. The Old Beauharnois Canal and the Soulanges Canal, neither of which are still in use, and the Beauharnois Canal have contributed to changes in flow of the rivière Saint-Charles. Historically, it has been a significant source of hydroelectric power for factories in Salaberry-de-Valleyfield. Much of the river's banks are developed, but a portion of its banks remain undeveloped. The river supports many species of fish, birds etc.

Because of the damming of the Saint Lawrence, many fish species are left without sufficient areas to migrate up and downstream. The rivière Saint-Charles has only one small dam at its mouth. This makes it an excellent spot for fish migration. A fish migration pass was put in place in ___ to allow for more ease of migration. Data has shown that the pass has worked for some species, such as the cyprinide (reference this).

The Rivière Saint-Charles is in the physiographic region of the Saint Lawrence Plain. It is