Lac du Tréfonds is a Lake located in Lac-Pikauba; Charlevoix, Quebec and has an elevation of 945 meters.

• Latitude: 47° 47' 52'' North   (decimal: 47.7977778)
• Longitude: 70° 59' 8'' West   (decimal: -70.9855556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 945 meters
• Location: Lac-Pikauba; Charlevoix
• Atlas of Canada Locator Map: Lac du Tréfonds
• GPS Coordinate Locator Map: Lac du Tréfonds Lat/Long