Lac Vaillant is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 61° 28' 7'' North   (decimal: 61.4686223)
• Longitude: 73° 48' 46'' West   (decimal: -73.8127714)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Vaillant
• GPS Coordinate Locator Map: Lac Vaillant Lat/Long