Lac Jeff is a Lake located in Lac-Blanc; Portneuf, Quebec.

• Latitude: 47° 14' 45'' North   (decimal: 47.2458600)
• Longitude: 71° 59' 28'' West   (decimal: -71.9912019)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Blanc; Portneuf
• Atlas of Canada Locator Map: Lac Jeff
• GPS Coordinate Locator Map: Lac Jeff Lat/Long