Lac Thomasse is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 392 meters.

• Latitude: 49° 11' 8'' North   (decimal: 49.1855556)
• Longitude: 73° 32' 43'' West   (decimal: -73.5452778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 392 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Thomasse
• GPS Coordinate Locator Map: Lac Thomasse Lat/Long