Baie du Lac à Castor is a Bay located in Côte-Nord-du-Golfe-du-Saint-Laurent; Basse-Côte-Nord, Quebec.

• Latitude: 50° 17' 0'' North   (decimal: 50.2834025)
• Longitude: 61° 10' 41'' West   (decimal: -61.1781219)
• Topography Feature Category: Bay
• Geographical Feature: Baie
• Canadian Province/Territory: Quebec
• Location: Côte-Nord-du-Golfe-du-Saint-Laurent; Basse-Côte-Nord
• Atlas of Canada Locator Map: Baie du Lac à Castor
• GPS Coordinate Locator Map: Baie du Lac à Castor Lat/Long