Lac du Grand Arc is a Lake located in Lac-au-Brochet; La Haute-Côte-Nord, Quebec and has an elevation of 308 meters.

• Latitude: 48° 57' 36'' North   (decimal: 48.9600317)
• Longitude: 69° 22' 9'' West   (decimal: -69.3692213)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 308 meters
• Location: Lac-au-Brochet; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac du Grand Arc
• GPS Coordinate Locator Map: Lac du Grand Arc Lat/Long