Lac Guay is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 485 meters.

• Latitude: 48° 22' 42'' North   (decimal: 48.3783333)
• Longitude: 72° 59' 6'' West   (decimal: -72.985)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 485 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac Guay
• GPS Coordinate Locator Map: Lac Guay Lat/Long