Lac Blais is a Lake located in Lac-Marguerite; Antoine-Labelle, Quebec and has an elevation of 339 meters.

• Latitude: 47° 9' 13'' North   (decimal: 47.1536111)
• Longitude: 75° 56' 17'' West   (decimal: -75.9380556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 339 meters
• Location: Lac-Marguerite; Antoine-Labelle
• Atlas of Canada Locator Map: Lac Blais
• GPS Coordinate Locator Map: Lac Blais Lat/Long