Lac du Havresac is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 49' 50'' North   (decimal: 48.8305960)
• Longitude: 70° 51' 43'' West   (decimal: -70.8620205)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac du Havresac
• GPS Coordinate Locator Map: Lac du Havresac Lat/Long