Clarks Island is a Island located in Northumberland, Ontario and has an elevation of 165 meters.

• Latitude: 44° 20' 31'' North   (decimal: 44.3419444)
• Longitude: 77° 46' 31'' West   (decimal: -77.7752777)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 165 meters
• Location: Northumberland
• Atlas of Canada Locator Map: Clarks Island
• GPS Coordinate Locator Map: Clarks Island Lat/Long