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

• Latitude: 48° 51' 13'' North   (decimal: 48.8536464)
• Longitude: 70° 21' 31'' West   (decimal: -70.3586772)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac de la Grosse Roche
• GPS Coordinate Locator Map: Lac de la Grosse Roche Lat/Long