Lac à la Grosse is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 49' 7'' North   (decimal: 48.8186111)
• Longitude: 70° 30' 12'' West   (decimal: -70.5033333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac à la Grosse
• GPS Coordinate Locator Map: Lac à la Grosse Lat/Long