Lac Langlais is a Lake located in Cascades-Malignes; La Vallée-de-la-Gatineau, Quebec and has an elevation of 407 meters.

• Latitude: 47° 18' 47'' North   (decimal: 47.3130556)
• Longitude: 76° 7' 40'' West   (decimal: -76.1277778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 407 meters
• Location: Cascades-Malignes; La Vallée-de-la-Gatineau
• Atlas of Canada Locator Map: Lac Langlais
• GPS Coordinate Locator Map: Lac Langlais Lat/Long