Lac Long is a Lake located in Saint-Guillaume-Nord; Matawinie, Quebec and has an elevation of 429 meters.

• Latitude: 46° 19' 53'' North   (decimal: 46.3313889)
• Longitude: 73° 53' 24'' West   (decimal: -73.8900000)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 429 meters
• Location: Saint-Guillaume-Nord; Matawinie
• Atlas of Canada Locator Map: Lac Long
• GPS Coordinate Locator Map: Lac Long Lat/Long