Berthier-en-Bas is a Unincorporated area located in Berthier-sur-Mer; Montmagny, Quebec.

• Latitude: 46° 55' 34'' North   (decimal: 46.9261306)
• Longitude: 70° 44' 3'' West   (decimal: -70.7342520)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Bureau de poste
• Canadian Province/Territory: Quebec
• Location: Berthier-sur-Mer; Montmagny
• GPS Coordinate Locator Map: Berthier-en-Bas Lat/Long