Lac Guay is a Lake located in Chute-des-Passes; Maria-Chapdelaine, Quebec.

• Latitude: 50° 49' 47'' North   (decimal: 50.8297222)
• Longitude: 71° 35' 14'' West   (decimal: -71.5872222)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Chute-des-Passes; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac Guay
• GPS Coordinate Locator Map: Lac Guay Lat/Long