Lac sur les Montagnes is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 56° 37' 54'' North   (decimal: 56.6318010)
• Longitude: 68° 51' 29'' West   (decimal: -68.8579520)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac sur les Montagnes
• GPS Coordinate Locator Map: Lac sur les Montagnes Lat/Long