Sentinel Island is a Island located in Lanark, Ontario and has an elevation of 147 meters.

• Latitude: 44° 49' 16'' North   (decimal: 44.8211111)
• Longitude: 76° 14' 55'' West   (decimal: -76.2486111)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 147 meters
• Location: Lanark
• Atlas of Canada Locator Map: Sentinel Island
• GPS Coordinate Locator Map: Sentinel Island Lat/Long