Le Grand Marais is a River located in Sainte-Martine; Beauharnois-Salaberry, Quebec and has an elevation of 40 meters.

• Latitude: 45° 16' 9'' North   (decimal: 45.2692068)
• Longitude: 73° 48' 23'' West   (decimal: -73.8062629)
• Topography Feature Category: River
• Geographical Feature: Ruisseau
• Canadian Province/Territory: Quebec
• Elevation: 40 meters
• Location: Sainte-Martine; Beauharnois-Salaberry
• Atlas of Canada Locator Map: Le Grand Marais
• GPS Coordinate Locator Map: Le Grand Marais Lat/Long