Lac Cosnier is a Lake located in Baie-James; Jamésie, Quebec and has an elevation of 505 meters.

• Latitude: 50° 53' 32'' North   (decimal: 50.8922222)
• Longitude: 72° 42' 57'' West   (decimal: -72.7158333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 505 meters
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Cosnier
• GPS Coordinate Locator Map: Lac Cosnier Lat/Long