Lac Obtus is a Lake located in Saint-Alexis-des-Monts; Maskinongé, Quebec and has an elevation of 488 meters.

• Latitude: 46° 45' 9'' North   (decimal: 46.7525321)
• Longitude: 73° 15' 27'' West   (decimal: -73.2576310)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 488 meters
• Location: Saint-Alexis-des-Monts; Maskinongé
• Atlas of Canada Locator Map: Lac Obtus
• GPS Coordinate Locator Map: Lac Obtus Lat/Long