Lac Duplessis is a Lake located in Saint-Ambroise; Le Fjord-du-Saguenay, Quebec and has an elevation of 127 meters.

• Latitude: 48° 31' 30'' North   (decimal: 48.525)
• Longitude: 71° 18' 16'' West   (decimal: -71.3044444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 127 meters
• Location: Saint-Ambroise; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Duplessis
• GPS Coordinate Locator Map: Lac Duplessis Lat/Long