Lac Lost is a Lake located in Lac-au-Brochet; La Haute-Côte-Nord, Quebec.

• Latitude: 48° 46' 40'' North   (decimal: 48.7778075)
• Longitude: 69° 21' 46'' West   (decimal: -69.3628317)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-au-Brochet; La Haute-Côte-Nord
• GPS Coordinate Locator Map: Lac Lost Lat/Long