Lac Johnston is a Lake located in Saint-Joseph-de-Coleraine; L'Amiante, Quebec and has an elevation of 383 meters.

• Latitude: 46° 0' 17'' North   (decimal: 46.0047221)
• Longitude: 71° 23' 15'' West   (decimal: -71.3874999)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 383 meters
• Location: Saint-Joseph-de-Coleraine; L'Amiante
• Atlas of Canada Locator Map: Lac Johnston
• GPS Coordinate Locator Map: Lac Johnston Lat/Long