Lac Grand-Mère is a Lake located in Lac-au-Brochet; La Haute-Côte-Nord, Quebec and has an elevation of 623 meters.

• Latitude: 48° 53' 18'' North   (decimal: 48.8883333)
• Longitude: 69° 56' 59'' West   (decimal: -69.9497222)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 623 meters
• Location: Lac-au-Brochet; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac Grand-Mère
• GPS Coordinate Locator Map: Lac Grand-Mère Lat/Long