Lac Prometteur is a Lake located in Saint-Guillaume-Nord; Matawinie, Quebec and has an elevation of 608 meters.

• Latitude: 46° 31' 0'' North   (decimal: 46.5167053)
• Longitude: 73° 53' 14'' West   (decimal: -73.8870924)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 608 meters
• Location: Saint-Guillaume-Nord; Matawinie
• Atlas of Canada Locator Map: Lac Prometteur
• GPS Coordinate Locator Map: Lac Prometteur Lat/Long