Lac Saint-Louis is a Lake located in Châteauguay; Roussillon, Quebec and has an elevation of 30 meters.

• Latitude: 45° 24' 5'' North   (decimal: 45.4014284)
• Longitude: 73° 48' 51'' West   (decimal: -73.8140400)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 30 meters
• Location: Châteauguay; Roussillon
• Atlas of Canada Locator Map: Lac Saint-Louis
• GPS Coordinate Locator Map: Lac Saint-Louis Lat/Long