Rivière Bécancour is a 210-kilometre river flowing through the heart of Quebec, Canada, originating from Bécancour Lake in the town of Thetford Mines in the Chaudière-Appalaches region at an elevation of 402 metres (1,319 feet). The river winds westward through William Lake at Saint-Ferdinand before turning northward and ultimately emptying into the St. Lawrence River at the city of Bécancour in the Centre-du-Québec region, dropping to an elevation of just 6 metres at its mouth. Draining a basin of approximately 2,607 square kilometres, the Bécancour is a freestone river system of remarkable ecological diversity, supporting 66 species of fish across its watershed and offering anglers a wide variety of sport fishing opportunities from its Appalachian headwaters to its lowland reaches near the St. Lawrence.