Lac du Trois is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec.

• Latitude: 49° 15' 5'' North   (decimal: 49.2514166)
• Longitude: 72° 16' 48'' West   (decimal: -72.2800152)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac du Trois
• GPS Coordinate Locator Map: Lac du Trois Lat/Long