Île du Grand Saint-Augustin is a Island located in Baie-Trinité; Manicouagan, Quebec.

• Latitude: 49° 19' 24'' North   (decimal: 49.3233801)
• Longitude: 67° 24' 45'' West   (decimal: -67.4124953)
• Topography Feature Category: Island
• Geographical Feature: Île / Ile
• Canadian Province/Territory: Quebec
• Location: Baie-Trinité; Manicouagan
• Atlas of Canada Locator Map: Île du Grand Saint-Augustin
• GPS Coordinate Locator Map: Île du Grand Saint-Augustin Lat/Long