Lac à l'Oignon is a Lake located in Sainte-Anne-de-Portneuf; La Haute-Côte-Nord, Quebec and has an elevation of 191 meters.

• Latitude: 48° 43' 1'' North   (decimal: 48.7169735)
• Longitude: 69° 15' 26'' West   (decimal: -69.2572751)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 191 meters
• Location: Sainte-Anne-de-Portneuf; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac à l'Oignon
• GPS Coordinate Locator Map: Lac à l'Oignon Lat/Long