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

• Latitude: 57° 52' 23'' North   (decimal: 57.8730556)
• Longitude: 71° 26' 42'' West   (decimal: -71.445)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Ptarmigan
• GPS Coordinate Locator Map: Lac Ptarmigan Lat/Long