Étang du Castor is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 56° 11' 34'' North   (decimal: 56.1929056)
• Longitude: 68° 26' 3'' West   (decimal: -68.4340411)
• Topography Feature Category: Lake
• Geographical Feature: Étang
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• GPS Coordinate Locator Map: Étang du Castor Lat/Long