Lac Valdemars is a Lake located in Brownsburg-Chatham; Argenteuil, Quebec.

• Latitude: 45° 43' 40'' North   (decimal: 45.7277778)
• Longitude: 74° 22' 19'' West   (decimal: -74.3719444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Brownsburg-Chatham; Argenteuil
• Atlas of Canada Locator Map: Lac Valdemars
• GPS Coordinate Locator Map: Lac Valdemars Lat/Long