Cours d'eau Castonguay is a River located in Chazel; Abitibi-Ouest, Quebec.

• Latitude: 48° 51' 15'' North   (decimal: 48.8542596)
• Longitude: 78° 58' 10'' West   (decimal: -78.9695305)
• Topography Feature Category: River
• Geographical Feature: Cours d'eau agricole
• Canadian Province/Territory: Quebec
• Location: Chazel; Abitibi-Ouest
• Atlas of Canada Locator Map: Cours d'eau Castonguay
• GPS Coordinate Locator Map: Cours d'eau Castonguay Lat/Long