Lac Marthe is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 481 meters.

• Latitude: 48° 23' 41'' North   (decimal: 48.3947222)
• Longitude: 72° 52' 1'' West   (decimal: -72.8669444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 481 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Marthe
• GPS Coordinate Locator Map: Lac Marthe Lat/Long