Château-d'Eau is a Unincorporated area located in Alma; Lac-Saint-Jean-Est, Quebec.

• Latitude: 48° 31' 36'' North   (decimal: 48.5267131)
• Longitude: 71° 37' 52'' West   (decimal: -71.6312160)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Secteur résidentiel
• Canadian Province/Territory: Quebec
• Location: Alma; Lac-Saint-Jean-Est
• GPS Coordinate Locator Map: Château-d'Eau Lat/Long