The Blanche River (, , ) flows in the administrative region of Chaudière-Appalaches, in the province of Quebec, in Canada, in the regional county municipality of:
The Blanche River is a tributary of the north shore of Etchemin River which flows toward north and empties on the shore into the St. Lawrence River, in front of Quebec.
The main neighboring watersheds of the Blanche river are:
The Blanche river has its source in the Massif du Sud, in the Notre Dame Mountains, in the municipality of Saint-Luc-de-Bellechasse. This spring is located south of the center of the village of Saint-Philémon and south-east of the summit of mont du Midi.
From its source, the Blanche river flows in a forest zone over distributed according to the following segments:
The Blanche river flows onto the north bank of the Etchemin River which here constitutes the municipal limit between Saint-Luc-de-Bellechasse and Sainte-Sabine. The confluence of the Blanche river is located upstream of the confluence of the Bourget river and east of the center of the village of Saint-Luc-de-Bellechasse.
The toponym Rivière Blanche was formalized on 18 July 1973 at the Commission de toponymie du Québec. Before 1973, its official name was Rivière Etchemin Nord-Est although its current name was visible on some maps long before its officialization.