Third Island is a Island located in Peterborough, Ontario and has an elevation of 241 meters.

• Latitude: 44° 26' 49'' North   (decimal: 44.4469444)
• Longitude: 78° 16' 8'' West   (decimal: -78.2688888)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 241 meters
• Location: Peterborough
• Atlas of Canada Locator Map: Third Island
• GPS Coordinate Locator Map: Third Island Lat/Long