Lac Saint-Eustache is a Lake located in Sainte-Marie-de-Blandford; Bécancour, Quebec.

• Latitude: 46° 20' 56'' North   (decimal: 46.3488999)
• Longitude: 72° 9' 18'' West   (decimal: -72.1549999)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Sainte-Marie-de-Blandford; Bécancour
• GPS Coordinate Locator Map: Lac Saint-Eustache Lat/Long