Grand lac Sec is a Lake located in Hébertville; Lac-Saint-Jean-Est, Quebec and has an elevation of 157 meters.

• Latitude: 48° 22' 46'' North   (decimal: 48.3794444)
• Longitude: 71° 42' 29'' West   (decimal: -71.7080556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 157 meters
• Location: Hébertville; Lac-Saint-Jean-Est
• Atlas of Canada Locator Map: Grand lac Sec
• GPS Coordinate Locator Map: Grand lac Sec Lat/Long