Lac Mistassini is a Lake located in Rivière-Nipissis; Sept-Rivières, Quebec and has an elevation of 603 meters.

• Latitude: 51° 31' 57'' North   (decimal: 51.5325550)
• Longitude: 65° 54' 36'' West   (decimal: -65.9099188)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 603 meters
• Location: Rivière-Nipissis; Sept-Rivières
• Atlas of Canada Locator Map: Lac Mistassini
• GPS Coordinate Locator Map: Lac Mistassini Lat/Long