Fortress Island is a Island located in Mackenzie, Northwest Territories.

• Latitude: 62° 39' 1'' North   (decimal: 62.6501863)
• Longitude: 110° 24' 4'' West   (decimal: -110.4010537)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Northwest Territories
• Location: Mackenzie
• Atlas of Canada Locator Map: Fortress Island
• GPS Coordinate Locator Map: Fortress Island Lat/Long