Lac du Marais is a Lake located in Rivière-aux-Outardes; Manicouagan, Quebec.

• Latitude: 50° 32' 15'' North   (decimal: 50.5375807)
• Longitude: 69° 45' 6'' West   (decimal: -69.7517789)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac du Marais
• GPS Coordinate Locator Map: Lac du Marais Lat/Long