Lac Souste is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 390 meters.

• Latitude: 49° 29' 1'' North   (decimal: 49.4836111)
• Longitude: 73° 25' 38'' West   (decimal: -73.4272222)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 390 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Souste
• GPS Coordinate Locator Map: Lac Souste Lat/Long