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

• Latitude: 49° 13' North   (decimal: 49.2166999)
• Longitude: 69° 38' West   (decimal: -69.6332999)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-au-Brochet; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac Fast
• GPS Coordinate Locator Map: Lac Fast Lat/Long