Rivière Castor is a River located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 49° 3' 7'' North   (decimal: 49.0519444)
• Longitude: 70° 36' 40'' West   (decimal: -70.6111111)
• Topography Feature Category: River
• Geographical Feature: Rivière
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Rivière Castor
• GPS Coordinate Locator Map: Rivière Castor Lat/Long