Lac des Joncs is a Lake located in Baie-de-la-Bouteille; Matawinie, Quebec.

• Latitude: 47° 13' 5'' North   (decimal: 47.2181086)
• Longitude: 74° 9' 15'' West   (decimal: -74.1540325)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-de-la-Bouteille; Matawinie
• Atlas of Canada Locator Map: Lac des Joncs
• GPS Coordinate Locator Map: Lac des Joncs Lat/Long