Lac Gros Castor is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 543 meters.

• Latitude: 48° 19' 50'' North   (decimal: 48.3305556)
• Longitude: 72° 58' 25'' West   (decimal: -72.9736111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 543 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Gros Castor
• GPS Coordinate Locator Map: Lac Gros Castor Lat/Long