Lac à Grandmaison is a Lake located in Saint-François-Xavier-de-Viger; Rivière-du-Loup, Quebec.

• Latitude: 47° 51' 41'' North   (decimal: 47.8614110)
• Longitude: 69° 12' 24'' West   (decimal: -69.2067024)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Saint-François-Xavier-de-Viger; Rivière-du-Loup
• Atlas of Canada Locator Map: Lac à Grandmaison
• GPS Coordinate Locator Map: Lac à Grandmaison Lat/Long