Rocher aux Grêlons is a Island located in Saint-Antoine-de-l'Isle-aux-Grues; Montmagny, Quebec and has an elevation of 3 meters.

• Latitude: 47° 8' 17'' North   (decimal: 47.1380782)
• Longitude: 70° 27' 14'' West   (decimal: -70.4539643)
• Topography Feature Category: Island
• Geographical Feature: Rocher
• Canadian Province/Territory: Quebec
• Elevation: 3 meters
• Location: Saint-Antoine-de-l'Isle-aux-Grues; Montmagny
• Atlas of Canada Locator Map: Rocher aux Grêlons
• GPS Coordinate Locator Map: Rocher aux Grêlons Lat/Long