Lac Sylvie is a Lake located in Lac-Pythonga; La Vallée-de-la-Gatineau, Quebec.

• Latitude: 46° 51' 30'' North   (decimal: 46.8583952)
• Longitude: 76° 44' 44'' West   (decimal: -76.7455274)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Pythonga; La Vallée-de-la-Gatineau
• Atlas of Canada Locator Map: Lac Sylvie
• GPS Coordinate Locator Map: Lac Sylvie Lat/Long