Lac Monast is a Lake located in Duparquet; Abitibi-Ouest, Quebec.

• Latitude: 48° 28' 26'' North   (decimal: 48.4738888)
• Longitude: 79° 8' 30'' West   (decimal: -79.1416666)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Duparquet; Abitibi-Ouest
• Atlas of Canada Locator Map: Lac Monast
• GPS Coordinate Locator Map: Lac Monast Lat/Long