Lac Desmarteaux is a Lake located in Lac-Walker; Sept-Rivières, Quebec.

• Latitude: 50° 21' 4'' North   (decimal: 50.3511111)
• Longitude: 67° 6' 0'' West   (decimal: -67.1)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Walker; Sept-Rivières
• Atlas of Canada Locator Map: Lac Desmarteaux
• GPS Coordinate Locator Map: Lac Desmarteaux Lat/Long