Lac Défoncé is a Lake located in Girardville; Maria-Chapdelaine, Quebec and has an elevation of 184 meters.

• Latitude: 48° 57' 54'' North   (decimal: 48.965)
• Longitude: 72° 29' 45'' West   (decimal: -72.4958333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 184 meters
• Location: Girardville; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac Défoncé
• GPS Coordinate Locator Map: Lac Défoncé Lat/Long