Upper Sister Island is a Island located in Frontenac, Ontario and has an elevation of 253 meters.

• Latitude: 44° 49' 17'' North   (decimal: 44.8213888)
• Longitude: 76° 58' 4'' West   (decimal: -76.9677777)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 253 meters
• Location: Frontenac
• Atlas of Canada Locator Map: Upper Sister Island
• GPS Coordinate Locator Map: Upper Sister Island Lat/Long