Lac Grand-Mère is a Lake located in Lac-Legendre; Matawinie, Quebec and has an elevation of 477 meters.

• Latitude: 46° 42' 42'' North   (decimal: 46.7117098)
• Longitude: 74° 21' 24'' West   (decimal: -74.3565519)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 477 meters
• Location: Lac-Legendre; Matawinie
• Atlas of Canada Locator Map: Lac Grand-Mère
• GPS Coordinate Locator Map: Lac Grand-Mère Lat/Long