La Grosse Île is a Island located in Saint-Alexis-des-Monts; Maskinongé, Quebec and has an elevation of 287 meters.

• Latitude: 46° 30' 51'' North   (decimal: 46.5141978)
• Longitude: 73° 13' 46'' West   (decimal: -73.2295740)
• Topography Feature Category: Island
• Geographical Feature: Île / Ile
• Canadian Province/Territory: Quebec
• Elevation: 287 meters
• Location: Saint-Alexis-des-Monts; Maskinongé
• Atlas of Canada Locator Map: La Grosse Île
• GPS Coordinate Locator Map: La Grosse Île Lat/Long