Lac Ernest is a Lake located in Notre-Dame-de-Montauban; Mékinac, Quebec and has an elevation of 222 meters.

• Latitude: 46° 54' 55'' North   (decimal: 46.9152777)
• Longitude: 72° 16' 34'' West   (decimal: -72.2761111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 222 meters
• Location: Notre-Dame-de-Montauban; Mékinac
• Atlas of Canada Locator Map: Lac Ernest
• GPS Coordinate Locator Map: Lac Ernest Lat/Long