Grand lac du Portage is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 49° 15' 36'' North   (decimal: 49.26)
• Longitude: 70° 55' 42'' West   (decimal: -70.9283333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• GPS Coordinate Locator Map: Grand lac du Portage Lat/Long