Third Adder Lake is a Lake located in Northumberland, New Brunswick and has an elevation of 443 meters.

• Latitude: 47° 5' 13'' North   (decimal: 47.0868122)
• Longitude: 66° 49' 47'' West   (decimal: -66.8295951)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: New Brunswick
• Elevation: 443 meters
• Location: Northumberland
• Atlas of Canada Locator Map: Third Adder Lake
• GPS Coordinate Locator Map: Third Adder Lake Lat/Long