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

• Latitude: 47° 21' 28'' North   (decimal: 47.3578448)
• Longitude: 75° 51' 2'' West   (decimal: -75.8504775)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Lenôtre; La Vallée-de-la-Gatineau
• Atlas of Canada Locator Map: Lac Sec
• GPS Coordinate Locator Map: Lac Sec Lat/Long