Mary Rocks is a Shoal located in Simcoe, Ontario and has an elevation of 181 meters.

• Latitude: 44° 46' 12'' North   (decimal: 44.7699999)
• Longitude: 79° 43' 27'' West   (decimal: -79.7241666)
• Topography Feature Category: Shoal
• Geographical Feature: Rocks
• Canadian Province/Territory: Ontario
• Elevation: 181 meters
• Location: Simcoe
• Atlas of Canada Locator Map: Mary Rocks
• GPS Coordinate Locator Map: Mary Rocks Lat/Long