Lac du Grand Détour is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec and has an elevation of 411 meters.

• Latitude: 49° 58' 5'' North   (decimal: 49.9681130)
• Longitude: 70° 32' 2'' West   (decimal: -70.5340073)
• Topography Feature Category: Lake
• Geographical Feature: Réservoir
• Canadian Province/Territory: Quebec
• Elevation: 411 meters
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac du Grand Détour
• GPS Coordinate Locator Map: Lac du Grand Détour Lat/Long