Sir-John Lake is a Unincorporated area located in Lachute; Argenteuil, Quebec and has an elevation of 200 meters.

• Latitude: 45° 43' North   (decimal: 45.7166666)
• Longitude: 74° 17' West   (decimal: -74.2833332)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Lieu-dit
• Canadian Province/Territory: Quebec
• Elevation: 200 meters
• Location: Lachute; Argenteuil
• Atlas of Canada Locator Map: Sir-John Lake
• GPS Coordinate Locator Map: Sir-John Lake Lat/Long