Lac Serpent is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 50° 11' 30'' North   (decimal: 50.1916667)
• Longitude: 70° 4' 6'' West   (decimal: -70.0683333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Serpent
• GPS Coordinate Locator Map: Lac Serpent Lat/Long