Lac Ernest is a Lake located in Rivière-aux-Outardes; Manicouagan, Quebec.

• Latitude: 49° 21' 55'' North   (decimal: 49.3653253)
• Longitude: 68° 7' 53'' West   (decimal: -68.1314130)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac Ernest
• GPS Coordinate Locator Map: Lac Ernest Lat/Long