Lac à Tonio is a Lake located in Sainte-Justine; Les Etchemins, Quebec and has an elevation of 397 meters.

• Latitude: 46° 25' 39'' North   (decimal: 46.4275000)
• Longitude: 70° 21' 16'' West   (decimal: -70.3544444)
• Topography Feature Category: Lake
• Geographical Feature: Lac artificiel
• Canadian Province/Territory: Quebec
• Elevation: 397 meters
• Location: Sainte-Justine; Les Etchemins
• Atlas of Canada Locator Map: Lac à Tonio
• GPS Coordinate Locator Map: Lac à Tonio Lat/Long