Lac du Castor is a Lake located in Waltham; Pontiac, Quebec.

• Latitude: 46° 3' 13'' North   (decimal: 46.0536679)
• Longitude: 76° 54' 59'' West   (decimal: -76.9163858)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Waltham; Pontiac
• Atlas of Canada Locator Map: Lac du Castor
• GPS Coordinate Locator Map: Lac du Castor Lat/Long