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

• Latitude: 49° 49' 29'' North   (decimal: 49.8247683)
• Longitude: 67° 39' 8'' West   (decimal: -67.6522018)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac Marius
• GPS Coordinate Locator Map: Lac Marius Lat/Long