Mains Lake is a Lake located in Northumberland, New Brunswick and has an elevation of 349 meters.

• Latitude: 46° 56' 19'' North   (decimal: 46.9386474)
• Longitude: 66° 28' 29'' West   (decimal: -66.4746593)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: New Brunswick
• Elevation: 349 meters
• Location: Northumberland
• Atlas of Canada Locator Map: Mains Lake
• GPS Coordinate Locator Map: Mains Lake Lat/Long