Cours d'eau du Dix-Huit is a River located in Saint-Félix-d'Otis; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 18' 2'' North   (decimal: 48.3005556)
• Longitude: 70° 40' 14'' West   (decimal: -70.6705556)
• Topography Feature Category: River
• Geographical Feature: Cours d'eau agricole
• Canadian Province/Territory: Quebec
• Location: Saint-Félix-d'Otis; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Cours d'eau du Dix-Huit
• GPS Coordinate Locator Map: Cours d'eau du Dix-Huit Lat/Long