Petit lac Castor is a Lake located in Saint-Zénon; Matawinie, Quebec.

• Latitude: 46° 34' 17'' North   (decimal: 46.5714263)
• Longitude: 73° 43' 50'' West   (decimal: -73.7304201)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Saint-Zénon; Matawinie
• GPS Coordinate Locator Map: Petit lac Castor Lat/Long