Lac Sylvain is a Lake located in Lac-Oscar; Antoine-Labelle, Quebec.

• Latitude: 47° 9' 51'' North   (decimal: 47.1641667)
• Longitude: 75° 14' 17'' West   (decimal: -75.2380556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Oscar; Antoine-Labelle
• Atlas of Canada Locator Map: Lac Sylvain
• GPS Coordinate Locator Map: Lac Sylvain Lat/Long