Étang du Castor is a Lake located in Lac-des-Eaux-Mortes; La Mitis, Quebec.

• Latitude: 48° 15' 34'' North   (decimal: 48.2594890)
• Longitude: 67° 51' 9'' West   (decimal: -67.8525033)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-des-Eaux-Mortes; La Mitis
• Atlas of Canada Locator Map: Étang du Castor
• GPS Coordinate Locator Map: Étang du Castor Lat/Long