Lac Grand-Mère is a Lake located in Ferland-et-Boilleau; Le Fjord-du-Saguenay, Quebec and has an elevation of 363 meters.

• Latitude: 48° 9' 15'' North   (decimal: 48.1541667)
• Longitude: 70° 47' 37'' West   (decimal: -70.7936111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 363 meters
• Location: Ferland-et-Boilleau; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Grand-Mère
• GPS Coordinate Locator Map: Lac Grand-Mère Lat/Long