Lac Mayn Achiiyut is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 54° 59' 14'' North   (decimal: 54.9872222)
• Longitude: 73° 42' 32'' West   (decimal: -73.7088889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Mayn Achiiyut
• GPS Coordinate Locator Map: Lac Mayn Achiiyut Lat/Long