La Grosse-Roche is a Unincorporated area located in Marston; Le Granit, Quebec and has an elevation of 447 meters.

• Latitude: 45° 35' 37'' North   (decimal: 45.5936525)
• Longitude: 70° 56' 21'' West   (decimal: -70.9392426)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Hameau
• Canadian Province/Territory: Quebec
• Elevation: 447 meters
• Location: Marston; Le Granit
• Atlas of Canada Locator Map: La Grosse-Roche
• GPS Coordinate Locator Map: La Grosse-Roche Lat/Long