Duke Island is a Island located in Thunder Bay, Ontario and has an elevation of 271 meters.

• Latitude: 50° 7' 16'' North   (decimal: 50.1211111)
• Longitude: 88° 19' 10'' West   (decimal: -88.3194444)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 271 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: Duke Island
• GPS Coordinate Locator Map: Duke Island Lat/Long