Lac des Trois Côtes is a Bay located in Port-Cartier; Sept-Rivières, Quebec.

• Latitude: 49° 47' 2'' North   (decimal: 49.7839351)
• Longitude: 67° 11' 11'' West   (decimal: -67.1863547)
• Topography Feature Category: Bay
• Geographical Feature: Bras morts
• Canadian Province/Territory: Quebec
• Location: Port-Cartier; Sept-Rivières
• Atlas of Canada Locator Map: Lac des Trois Côtes
• GPS Coordinate Locator Map: Lac des Trois Côtes Lat/Long