Lac Guay is a Lake located in Baie-James; Jamésie, Quebec and has an elevation of 259 meters.

• Latitude: 49° 59' 45'' North   (decimal: 49.9958333)
• Longitude: 78° 1' 19'' West   (decimal: -78.0219444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 259 meters
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Guay
• GPS Coordinate Locator Map: Lac Guay Lat/Long