Petit lac des Joncs is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 49° 58' 19'' North   (decimal: 49.9719444)
• Longitude: 74° 38' 37'' West   (decimal: -74.6436111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• GPS Coordinate Locator Map: Petit lac des Joncs Lat/Long