Mary Island is a Island located in Thunder Bay, Ontario and has an elevation of 183 meters.

• Latitude: 48° 30' 12'' North   (decimal: 48.5033333)
• Longitude: 88° 59' 10'' West   (decimal: -88.9861111)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 183 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: Mary Island
• GPS Coordinate Locator Map: Mary Island Lat/Long