Lac des Joncs is a Lake located in Saint-Marcellin; Rimouski-Neigette, Quebec and has an elevation of 247 meters.

• Latitude: 48° 23' 2'' North   (decimal: 48.3839293)
• Longitude: 68° 17' 8'' West   (decimal: -68.2855739)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 247 meters
• Location: Saint-Marcellin; Rimouski-Neigette
• Atlas of Canada Locator Map: Lac des Joncs
• GPS Coordinate Locator Map: Lac des Joncs Lat/Long