Lac Welden is a Lake located in Grenville-sur-la-Rouge; Argenteuil, Quebec and has an elevation of 235 meters.

• Latitude: 45° 43' 47'' North   (decimal: 45.7297222)
• Longitude: 74° 37' 3'' West   (decimal: -74.6174999)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 235 meters
• Location: Grenville-sur-la-Rouge; Argenteuil
• Atlas of Canada Locator Map: Lac Welden
• GPS Coordinate Locator Map: Lac Welden Lat/Long