Lac Deroy is a Lake located in Lac-Walker; Sept-Rivières, Quebec and has an elevation of 271 meters.

• Latitude: 49° 37' 4'' North   (decimal: 49.6178243)
• Longitude: 67° 29' 47'' West   (decimal: -67.4963759)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 271 meters
• Location: Lac-Walker; Sept-Rivières
• Atlas of Canada Locator Map: Lac Deroy
• GPS Coordinate Locator Map: Lac Deroy Lat/Long