Lac Marthe is a Lake located in Rivière-aux-Outardes; Manicouagan, Quebec and has an elevation of 351 meters.

• Latitude: 50° 3' 10'' North   (decimal: 50.0527778)
• Longitude: 68° 24' 54'' West   (decimal: -68.415)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 351 meters
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac Marthe
• GPS Coordinate Locator Map: Lac Marthe Lat/Long