Mary Island is a Island located in Parry Sound, Ontario and has an elevation of 178 meters.

• Latitude: 45° 22' 39'' North   (decimal: 45.3774999)
• Longitude: 80° 4' 50'' West   (decimal: -80.0805555)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 178 meters
• Location: Parry Sound
• Atlas of Canada Locator Map: Mary Island
• GPS Coordinate Locator Map: Mary Island Lat/Long