Lac Diadème is a Lake located in Lac-Douaire; Antoine-Labelle, Quebec and has an elevation of 427 meters.

• Latitude: 47° 13' 0'' North   (decimal: 47.2166667)
• Longitude: 75° 21' 20'' West   (decimal: -75.3555556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 427 meters
• Location: Lac-Douaire; Antoine-Labelle
• Atlas of Canada Locator Map: Lac Diadème
• GPS Coordinate Locator Map: Lac Diadème Lat/Long