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

• Latitude: 49° 0' 5'' North   (decimal: 49.0014279)
• Longitude: 70° 37' 38'' West   (decimal: -70.6272927)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Sournois
• GPS Coordinate Locator Map: Lac Sournois Lat/Long