Rivière Marsac is a River located in Rivière-Mouchalagane; Caniapiscau, Quebec and has an elevation of 634 meters.

• Latitude: 52° 14' 40'' North   (decimal: 52.2445022)
• Longitude: 69° 40' 24'' West   (decimal: -69.6733235)
• Topography Feature Category: River
• Geographical Feature: Rivière
• Canadian Province/Territory: Quebec
• Elevation: 634 meters
• Location: Rivière-Mouchalagane; Caniapiscau
• Atlas of Canada Locator Map: Rivière Marsac
• GPS Coordinate Locator Map: Rivière Marsac Lat/Long