Sumack Island is a Island located in Ontario.

• Latitude: 46° 13' 3'' North   (decimal: 46.2174999)
• Longitude: 79° 25' 38'' West   (decimal: -79.4272000)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• GPS Coordinate Locator Map: Sumack Island Lat/Long