Lac Dumas is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 578 meters.

• Latitude: 48° 30' 57'' North   (decimal: 48.5158333)
• Longitude: 73° 32' 55'' West   (decimal: -73.5486111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 578 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Dumas
• GPS Coordinate Locator Map: Lac Dumas Lat/Long