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

• Latitude: 48° 29' 26'' North   (decimal: 48.4905556)
• Longitude: 70° 30' 18'' West   (decimal: -70.505)
• 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