Long Grass Lake is a Lake located in Rainy River, Ontario and has an elevation of 400 meters.

• Latitude: 49° 5' 35'' North   (decimal: 49.0930555)
• Longitude: 93° 5' 21'' West   (decimal: -93.0891666)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: Ontario
• Elevation: 400 meters
• Location: Rainy River
• Atlas of Canada Locator Map: Long Grass Lake
• GPS Coordinate Locator Map: Long Grass Lake Lat/Long