Lac à Tremblay is a Lake located in Hébertville; Lac-Saint-Jean-Est, Quebec.

• Latitude: 48° 22' 21'' North   (decimal: 48.3725)
• Longitude: 71° 41' 18'' West   (decimal: -71.6883333)
• Topography Feature Category: Lake
• Geographical Feature: Étang
• Canadian Province/Territory: Quebec
• Location: Hébertville; Lac-Saint-Jean-Est
• Atlas of Canada Locator Map: Lac à Tremblay
• GPS Coordinate Locator Map: Lac à Tremblay Lat/Long