Lac à la Mousse is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 55° 43' 56'' North   (decimal: 55.7323197)
• Longitude: 67° 13' 47'' West   (decimal: -67.2298371)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac à la Mousse
• GPS Coordinate Locator Map: Lac à la Mousse Lat/Long