Riordan Lake is a Lake located in Northumberland, New Brunswick and has an elevation of 434 meters.

• Latitude: 47° 12' 47'' North   (decimal: 47.2131135)
• Longitude: 66° 18' 48'' West   (decimal: -66.3132292)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: New Brunswick
• Elevation: 434 meters
• Location: Northumberland
• Atlas of Canada Locator Map: Riordan Lake
• GPS Coordinate Locator Map: Riordan Lake Lat/Long