Dewdney Rock is a Island located in Algoma, Ontario and has an elevation of 176 meters.

• Latitude: 46° 7' 14'' North   (decimal: 46.1205555)
• Longitude: 82° 37' 26'' West   (decimal: -82.6238888)
• Topography Feature Category: Island
• Geographical Feature: Islands
• Canadian Province/Territory: Ontario
• Elevation: 176 meters
• Location: Algoma
• Atlas of Canada Locator Map: Dewdney Rock
• GPS Coordinate Locator Map: Dewdney Rock Lat/Long