Lac Dumas is a Lake located in Baie-James; Jamésie, Quebec and has an elevation of 378 meters.

• Latitude: 50° 10' 3'' North   (decimal: 50.1675)
• Longitude: 75° 7' 29'' West   (decimal: -75.1247222)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 378 meters
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Dumas
• GPS Coordinate Locator Map: Lac Dumas Lat/Long