Lac de Dejeuner is a Lake located in Thunder Bay, Ontario and has an elevation of 503 meters.

• Latitude: 49° 15' 46'' North   (decimal: 49.2627777)
• Longitude: 90° 38' 28'' West   (decimal: -90.6411111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Ontario
• Elevation: 503 meters
• Location: Thunder Bay
• Atlas of Canada Locator Map: Lac de Dejeuner
• GPS Coordinate Locator Map: Lac de Dejeuner Lat/Long