The Rivière des Mille Îles is a channel of the Ottawa River in southwestern Quebec, Canada and runs into the Rivière des Prairies. It is 42 kilometres long. It divides Île Jésus from the North Shore, the northern mainland suburbs of Montreal, such as Deux-Montagnes, Saint-Eustache, Boisbriand, Rosemère, Lorraine, Bois-des-Filion, Sainte-Thérèse, and Terrebonne.