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

• Latitude: 47° 18' 25'' North   (decimal: 47.3069692)
• Longitude: 71° 47' 33'' West   (decimal: -71.7925902)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Blanc; Portneuf
• GPS Coordinate Locator Map: Lac Marc Lat/Long