Lac à Roger-Castonguay is a Lake located in Métis-sur-Mer; La Mitis, Quebec.

• Latitude: 48° 40' 30'' North   (decimal: 48.6749999)
• Longitude: 67° 55' 35'' West   (decimal: -67.9263888)
• Topography Feature Category: Lake
• Geographical Feature: Lac artificiel
• Canadian Province/Territory: Quebec
• Location: Métis-sur-Mer; La Mitis
• Atlas of Canada Locator Map: Lac à Roger-Castonguay
• GPS Coordinate Locator Map: Lac à Roger-Castonguay Lat/Long