Troisième lac Grandbois is a Lake located in Sainte-Thècle; Mékinac, Quebec and has an elevation of 312 meters.

• Latitude: 46° 53' 34'' North   (decimal: 46.8928073)
• Longitude: 72° 33' 40'' West   (decimal: -72.5612215)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 312 meters
• Location: Sainte-Thècle; Mékinac
• Atlas of Canada Locator Map: Troisième lac Grandbois
• GPS Coordinate Locator Map: Troisième lac Grandbois Lat/Long