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

• Latitude: 49° 38' 24'' North   (decimal: 49.6400000)
• Longitude: 88° 18' 49'' West   (decimal: -88.3136111)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 271 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: Hat Mountain Island
• GPS Coordinate Locator Map: Hat Mountain Island Lat/Long