Petit lac Castos is a Lake located in Lac-de-la-Maison-de-Pierre; Antoine-Labelle, Quebec and has an elevation of 484 meters.

• Latitude: 46° 41' 48'' North   (decimal: 46.6967127)
• Longitude: 74° 32' 18'' West   (decimal: -74.5382247)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 484 meters
• Location: Lac-de-la-Maison-de-Pierre; Antoine-Labelle
• Atlas of Canada Locator Map: Petit lac Castos
• GPS Coordinate Locator Map: Petit lac Castos Lat/Long