The Coteau-du-Lac rapids, stretching for 12.8 km between Lake St. Louis and Lake St. Francis, are the most turbulent section of the St. Lawrence River.

The water drops a total of 25.6 metres over this section, for an average slope of 1.9 metres per kilometre, the steepest anywhere on the St. Lawrence.

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Coteau-du-Lac: A Strategic Passage
Coteau-du-Lac: A Strategic Passage
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