Lac Ost is a Lake located in Réservoir-Dozois; Vallée-de-l'Or, Quebec and has an elevation of 368 meters.

• Latitude: 47° 27' 11'' North   (decimal: 47.4530556)
• Longitude: 77° 21' 54'' West   (decimal: -77.365)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 368 meters
• Location: Réservoir-Dozois; Vallée-de-l'Or
• Atlas of Canada Locator Map: Lac Ost
• GPS Coordinate Locator Map: Lac Ost Lat/Long