Ruisseau du Grand Marécage is a River located in Lac-Nilgaut; Pontiac, Quebec and has an elevation of 304 meters.

• Latitude: 46° 36' 36'' North   (decimal: 46.6100584)
• Longitude: 77° 18' 26'' West   (decimal: -77.3072338)
• Topography Feature Category: River
• Geographical Feature: Ruisseau
• Canadian Province/Territory: Quebec
• Elevation: 304 meters
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Ruisseau du Grand Marécage
• GPS Coordinate Locator Map: Ruisseau du Grand Marécage Lat/Long