Gem Island is a Island located in Lanark, Ontario and has an elevation of 133 meters.

• Latitude: 44° 48' 42'' North   (decimal: 44.8116666)
• Longitude: 76° 11' 42'' West   (decimal: -76.1949999)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 133 meters
• Location: Lanark
• Atlas of Canada Locator Map: Gem Island
• GPS Coordinate Locator Map: Gem Island Lat/Long