Lac Long is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec and has an elevation of 426 meters.

• Latitude: 49° 18' 22'' North   (decimal: 49.3061111)
• Longitude: 73° 18' 10'' West   (decimal: -73.3027778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 426 meters
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac Long
• GPS Coordinate Locator Map: Lac Long Lat/Long