Troisième lac Gagnon is a Lake located in Lac-aux-Sables; Mékinac, Quebec and has an elevation of 280 meters.

• Latitude: 46° 58' 10'' North   (decimal: 46.9694444)
• Longitude: 72° 25' 38'' West   (decimal: -72.4272221)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 280 meters
• Location: Lac-aux-Sables; Mékinac
• Atlas of Canada Locator Map: Troisième lac Gagnon
• GPS Coordinate Locator Map: Troisième lac Gagnon Lat/Long