Lac Dumas is a Lake located in Petit-Mécatina; Minganie, Quebec.

• Latitude: 51° 38' 44'' North   (decimal: 51.6456088)
• Longitude: 57° 56' 15'' West   (decimal: -57.9374109)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Petit-Mécatina; Minganie
• Atlas of Canada Locator Map: Lac Dumas
• GPS Coordinate Locator Map: Lac Dumas Lat/Long