Lac du Castor is a Bay located in Rivière-aux-Outardes; Manicouagan, Quebec.

• Latitude: 49° 43' 42'' North   (decimal: 49.7283333)
• Longitude: 67° 54' 44'' West   (decimal: -67.9122222)
• Topography Feature Category: Bay
• Geographical Feature: Baie
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac du Castor
• GPS Coordinate Locator Map: Lac du Castor Lat/Long