Lac Masco is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec.

• Latitude: 48° 16' 50'' North   (decimal: 48.2805556)
• Longitude: 72° 38' 21'' West   (decimal: -72.6391667)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Masco
• GPS Coordinate Locator Map: Lac Masco Lat/Long