Mary Island is a Island located in Muskoka, Ontario and has an elevation of 243 meters.

• Latitude: 44° 59' 57'' North   (decimal: 44.9991666)
• Longitude: 79° 28' 58'' West   (decimal: -79.4827777)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 243 meters
• Location: Muskoka
• Atlas of Canada Locator Map: Mary Island
• GPS Coordinate Locator Map: Mary Island Lat/Long