Lac à Duncan is a Lake located in Notre-Dame-du-Laus; Antoine-Labelle, Quebec and has an elevation of 310 meters.

• Latitude: 46° 1' 12'' North   (decimal: 46.02)
• Longitude: 75° 40' 21'' West   (decimal: -75.6725)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 310 meters
• Location: Notre-Dame-du-Laus; Antoine-Labelle
• Atlas of Canada Locator Map: Lac à Duncan
• GPS Coordinate Locator Map: Lac à Duncan Lat/Long