Lac Washamahwun is a Lake located in Lac-Walker; Sept-Rivières, Quebec and has an elevation of 286 meters.

• Latitude: 49° 48' 55'' North   (decimal: 49.8153239)
• Longitude: 67° 28' 26'' West   (decimal: -67.4738500)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 286 meters
• Location: Lac-Walker; Sept-Rivières
• Atlas of Canada Locator Map: Lac Washamahwun
• GPS Coordinate Locator Map: Lac Washamahwun Lat/Long