Lac du Castor is a Lake located in Chute-des-Passes; Maria-Chapdelaine, Quebec.

• Latitude: 49° 37' 38'' North   (decimal: 49.6272222)
• Longitude: 71° 43' 15'' West   (decimal: -71.7208333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Chute-des-Passes; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac du Castor
• GPS Coordinate Locator Map: Lac du Castor Lat/Long