Lac à Johnny is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec and has an elevation of 233 meters.

• Latitude: 49° 7' 4'' North   (decimal: 49.1177778)
• Longitude: 72° 33' 43'' West   (decimal: -72.5619444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 233 meters
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac à Johnny
• GPS Coordinate Locator Map: Lac à Johnny Lat/Long