Grand lac Long is a Lake located in Saint-Élie; Maskinongé, Quebec and has an elevation of 191 meters.

• Latitude: 46° 32' 28'' North   (decimal: 46.5411110)
• Longitude: 72° 57' 1'' West   (decimal: -72.9502777)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 191 meters
• Location: Saint-Élie; Maskinongé
• Atlas of Canada Locator Map: Grand lac Long
• GPS Coordinate Locator Map: Grand lac Long Lat/Long