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

• Latitude: 48° 59' 20'' North   (decimal: 48.9889286)
• Longitude: 70° 42' 48'' West   (decimal: -70.7134058)
• 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 Jonc
• GPS Coordinate Locator Map: Lac du Jonc Lat/Long