Île Hennessey is a Island located in Mansfield-et-Pontefract; Pontiac, Quebec and has an elevation of 103 meters.

• Latitude: 45° 50' 37'' North   (decimal: 45.8436111)
• Longitude: 76° 45' 33'' West   (decimal: -76.7591667)
• Topography Feature Category: Island
• Geographical Feature: Île / Ile
• Canadian Province/Territory: Quebec
• Elevation: 103 meters
• Location: Mansfield-et-Pontefract; Pontiac
• Atlas of Canada Locator Map: Île Hennessey
• GPS Coordinate Locator Map: Île Hennessey Lat/Long