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

• Latitude: 50° 23' 19'' North   (decimal: 50.3886673)
• Longitude: 69° 11' 49'' West   (decimal: -69.1968110)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac du Pourquoi
• GPS Coordinate Locator Map: Lac du Pourquoi Lat/Long