Lac Fosty is a Lake located in Rivière-Kipawa; Témiscamingue, Quebec.

• Latitude: 47° 26' 12'' North   (decimal: 47.4366667)
• Longitude: 78° 0' 28'' West   (decimal: -78.0077778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Kipawa; Témiscamingue
• Atlas of Canada Locator Map: Lac Fosty
• GPS Coordinate Locator Map: Lac Fosty Lat/Long