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

• Latitude: 51° 30' 33'' North   (decimal: 51.5091667)
• Longitude: 70° 7' 42'' West   (decimal: -70.1283333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Upatau
• GPS Coordinate Locator Map: Lac Upatau Lat/Long