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

• Latitude: 58° 8' 23'' North   (decimal: 58.1396242)
• Longitude: 70° 2' 12'' West   (decimal: -70.0365691)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Couteau
• GPS Coordinate Locator Map: Lac Couteau Lat/Long