Big Deadwater is a River feature located in Northumberland, New Brunswick and has an elevation of 340 meters.

• Latitude: 46° 58' 37'' North   (decimal: 46.9769784)
• Longitude: 66° 37' 51'' West   (decimal: -66.6309008)
• Topography Feature Category: River feature
• Geographical Feature: Deadwater
• Canadian Province/Territory: New Brunswick
• Elevation: 340 meters
• Location: Northumberland
• Atlas of Canada Locator Map: Big Deadwater
• GPS Coordinate Locator Map: Big Deadwater Lat/Long