Lac du Gros Mangeur is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 49° 4' 15'' North   (decimal: 49.0708729)
• Longitude: 70° 41' 8'' West   (decimal: -70.6856270)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac du Gros Mangeur
• GPS Coordinate Locator Map: Lac du Gros Mangeur Lat/Long