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

• Latitude: 55° 19' 12'' North   (decimal: 55.32)
• Longitude: 70° 16' 40'' West   (decimal: -70.2777778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Decoigne
• GPS Coordinate Locator Map: Lac Decoigne Lat/Long