Lac du Duché is a Lake located in Lac-Normand; Mékinac, Quebec.

• Latitude: 47° 0' 5'' North   (decimal: 47.0014234)
• Longitude: 73° 7' 24'' West   (decimal: -73.1234582)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Normand; Mékinac
• Atlas of Canada Locator Map: Lac du Duché
• GPS Coordinate Locator Map: Lac du Duché Lat/Long