The Rivière du Moulin flows entirely in the municipality of Saint-Louis-de-Blandford, located in the Arthabaska Regional County Municipality, in the administrative region of Centre-du-Québec, in Québec, in Canada.

The main hydrographic slopes near the "rivière du Moulin" are: The Moulin river takes its source in the locality "La Petite Belgique", in the area south of highway 20, in the municipality of Saint-Louis-de-Blandford.

This area is located 3.3 km (2.1 mi) north of the Bécancour River and 4.6 km (2.9 mi) northeast of the village center of Saint-Louis-de-Blandford.

Its confluence is located 3.5 km (2.2 mi) upstream from the highway 20 bridge and 2.5 km (1.6 mi) downstream from the route 162 bridge, which passes through the village of Saint-Louis-de-Blandford.

The toponym "rivière du Moulin" was made official on November 17, 1979, at the Commission de toponymie du Québec.