Twenty One Mile Lake is a Lake located in Restigouche, New Brunswick and has an elevation of 304 meters.

• Latitude: 47° 47' 35'' North   (decimal: 47.7930694)
• Longitude: 66° 45' 16'' West   (decimal: -66.7543773)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: New Brunswick
• Elevation: 304 meters
• Location: Restigouche
• Atlas of Canada Locator Map: Twenty One Mile Lake
• GPS Coordinate Locator Map: Twenty One Mile Lake Lat/Long