Mattawa Island is a Island located in Nipissing, Ontario and has an elevation of 165 meters.

• Latitude: 46° 18' 55'' North   (decimal: 46.3152777)
• Longitude: 78° 42' 32'' West   (decimal: -78.7088888)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Ontario
• Elevation: 165 meters
• Location: Nipissing
• Atlas of Canada Locator Map: Mattawa Island
• GPS Coordinate Locator Map: Mattawa Island Lat/Long