Monmouth Island is a Island located in Thunder Bay, Ontario and has an elevation of 185 meters.

• Latitude: 48° 45' 37'' North   (decimal: 48.7602777)
• Longitude: 86° 26' 9'' West   (decimal: -86.4358333)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 185 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: Monmouth Island
• GPS Coordinate Locator Map: Monmouth Island Lat/Long