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

• Latitude: 48° 36' 18'' North   (decimal: 48.605)
• Longitude: 70° 21' 1'' West   (decimal: -70.3502778)
• 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 Harfang
• GPS Coordinate Locator Map: Lac du Harfang Lat/Long