Lac Mandonnet is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 55° 9' 0'' North   (decimal: 55.15)
• Longitude: 71° 14' 22'' West   (decimal: -71.2394444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Mandonnet
• GPS Coordinate Locator Map: Lac Mandonnet Lat/Long