Mary Lake is a Lake located in Grey, Ontario and has an elevation of 245 meters.

• Latitude: 44° 44' 8'' North   (decimal: 44.7355555)
• Longitude: 81° 0' 8'' West   (decimal: -81.0022222)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: Ontario
• Elevation: 245 meters
• Location: Grey
• Atlas of Canada Locator Map: Mary Lake
• GPS Coordinate Locator Map: Mary Lake Lat/Long