Cotnam Island is a Unincorporated area located in Renfrew, Ontario and has an elevation of 107 meters.

• Latitude: 45° 47' 56'' North   (decimal: 45.7988888)
• Longitude: 77° 1' 55'' West   (decimal: -77.0319444)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Dispersed Rural Community
• Canadian Province/Territory: Ontario
• Elevation: 107 meters
• Location: Renfrew
• Atlas of Canada Locator Map: Cotnam Island
• GPS Coordinate Locator Map: Cotnam Island Lat/Long