Lac du Petit Bras is a Lake located in Saint-Just-de-Bretenières; Montmagny, Quebec.

• Latitude: 46° 34' 25'' North   (decimal: 46.5736393)
• Longitude: 70° 3' 41'' West   (decimal: -70.0614565)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Saint-Just-de-Bretenières; Montmagny
• Atlas of Canada Locator Map: Lac du Petit Bras
• GPS Coordinate Locator Map: Lac du Petit Bras Lat/Long