Le Grand-Marais is a Unincorporated area located in Métabetchouan¿Lac-à-la-Croix; Lac-Saint-Jean-Est, Quebec.

• Latitude: 48° 28' 10'' North   (decimal: 48.4694909)
• Longitude: 71° 48' 58'' West   (decimal: -71.8162232)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Secteur
• Canadian Province/Territory: Quebec
• Location: Métabetchouan¿Lac-à-la-Croix; Lac-Saint-Jean-Est
• Atlas of Canada Locator Map: Le Grand-Marais
• GPS Coordinate Locator Map: Le Grand-Marais Lat/Long