L'Assomption River

The Assomption River (in French "", named after the Assumption of Mary) is the most important waterway in the Lanaudière region of Quebec, Canada. It is over long. It has a drainage basin of . It flows from the Mont Tremblant massif. Seven significant rivers flow into the Assomption (de la Boule, Versailles, Noire, la Chaloupe, Ouareau, Saint-Esprit, and Achigan) before it flows into the Rivière des Prairies at Repentigny, Quebec.
About 150000 people live in the drainage area of this river.