Lac Grand-Mère is a Lake located in Saint-Siméon; Charlevoix-Est, Quebec and has an elevation of 203 meters.

• Latitude: 47° 59' 3'' North   (decimal: 47.9841869)
• Longitude: 69° 50' 20'' West   (decimal: -69.8389460)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 203 meters
• Location: Saint-Siméon; Charlevoix-Est
• Atlas of Canada Locator Map: Lac Grand-Mère
• GPS Coordinate Locator Map: Lac Grand-Mère Lat/Long