| Blanche River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Chaudière-Appalaches |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Les Appalaches Regional County Municipality |
| Length: | 8.2km (05.1miles) |
| Source1: | Forest streams |
| Source1 Location: | Thetford Mines |
| Source1 Coordinates: | 46.1237°N -71.3736°W |
| Source1 Elevation: | 526m (1,726feet) |
| Mouth: | Bécancour River |
| Mouth Location: | Thetford Mines |
| Mouth Coordinates: | 46.056°N -71.3431°W |
| Mouth Elevation: | 260m (850feet) |
| Progression: | Bécancour River, St. Lawrence River |
| Tributaries Left: | (upstream) ruisseau Tanguay |
| Tributaries Right: | (upstream) ruisseau Marcoux |
| Country: |  Canada |
The Blanche river (in French: rivière Blanche) is a tributary of the Bécancour River, which flows into the St. Lawrence River. The Blanche river flows in the municipality of Thetford Mines, in the Les Appalaches Regional County Municipality (MRC), in the administrative region of Chaudière-Appalaches, in the province of Quebec, in Canada.
The main neighboring watersheds of the Blanche river are:
The Blanche River draws its source from a mountain stream located on the east side of Mont Saint-Adrien and west of downtown Thetford Mines.
The Blanche river flows on towards the south, mainly in forest territory, according to the following segments:
The Blanche River empties on the north shore of the Bécancour River, northeast of Black Lake, near an open pit mine.
The toponym Rivière Blanche was formalized on December 5, 1975, at the Commission de toponymie du Québec.[2]