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

• Latitude: 56° 19' 20'' North   (decimal: 56.3223513)
• Longitude: 68° 37' 18'' West   (decimal: -68.6215584)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Castignon
• GPS Coordinate Locator Map: Lac Castignon Lat/Long