Lac du Duc is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 470 meters.

• Latitude: 48° 41' 43'' North   (decimal: 48.6952778)
• Longitude: 74° 5' 32'' West   (decimal: -74.0922222)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 470 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac du Duc
• GPS Coordinate Locator Map: Lac du Duc Lat/Long