Big Grass Lake is a Lake located in Mackenzie, Northwest Territories and has an elevation of 194 meters.

• Latitude: 67° 40' 0'' North   (decimal: 67.6667503)
• Longitude: 128° 34' 8'' West   (decimal: -128.5689183)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: Northwest Territories
• Elevation: 194 meters
• Location: Mackenzie
• Atlas of Canada Locator Map: Big Grass Lake
• GPS Coordinate Locator Map: Big Grass Lake Lat/Long