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

• Latitude: 49° 33' 32'' North   (decimal: 49.5589458)
• Longitude: 72° 52' 31'' West   (decimal: -72.8753898)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac du Silex
• GPS Coordinate Locator Map: Lac du Silex Lat/Long