The Blanche river flows in the municipalities of Saint-Pierre-Baptiste, Laurierville (Sainte-Julie sector) and Plessisville, in the L'Érable Regional County Municipality (MRC), in the administrative region of Centre-du-Québec, in province of Quebec, in Canada.

The main neighboring hydrographic slopes of the Blanche River are: The Blanche River has its source at Lac Camille (length: 0.8 kilometres (0.50 mi); altitude: 284 metres (932 ft)), located in Saint-Pierre-Baptiste.

This lake is located 6.2 kilometres (3.9 mi) south of the village of Laurierville and 10.7 kilometres (6.6 mi) east of downtown Plessisville.

From its source, the Blanche River flows on 8.3 kilometres (5.2 mi) in the following segments: The Blanche river empties on the south-eastern bank of the Bourbon River downstream of the "Savane stream", south of the village of Plessisville.

The toponym "rivière Blanche" was made official on March 6, 1970, at the Commission de toponymie du Québec.