Lac à William is a Lake located in Saint-Alphonse; Bonaventure, Quebec and has an elevation of 98 meters.

• Latitude: 48° 10' 15'' North   (decimal: 48.1708826)
• Longitude: 65° 35' 53'' West   (decimal: -65.5979825)
• Topography Feature Category: Lake
• Geographical Feature: Étang
• Canadian Province/Territory: Quebec
• Elevation: 98 meters
• Location: Saint-Alphonse; Bonaventure
• Atlas of Canada Locator Map: Lac à William
• GPS Coordinate Locator Map: Lac à William Lat/Long