Lac Desmarais is a Lake located in Lac-Lenôtre; La Vallée-de-la-Gatineau, Quebec.

• Latitude: 47° 29' 31'' North   (decimal: 47.4920147)
• Longitude: 75° 55' 13'' West   (decimal: -75.9202003)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Lenôtre; La Vallée-de-la-Gatineau
• Atlas of Canada Locator Map: Lac Desmarais
• GPS Coordinate Locator Map: Lac Desmarais Lat/Long