Irwin Rock is a Shoal located in Thunder Bay, Ontario and has an elevation of 183 meters.

• Latitude: 48° 27' 2'' North   (decimal: 48.4505555)
• Longitude: 88° 23' 31'' West   (decimal: -88.3919444)
• Topography Feature Category: Shoal
• Geographical Feature: Rock
• Canadian Province/Territory: Ontario
• Elevation: 183 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: Irwin Rock
• GPS Coordinate Locator Map: Irwin Rock Lat/Long