The table below lists all the named locations for bird recording in Essex. The area covered corresponds to the Watsonian vice counties of North Essex and South Essex which approximates to the modern county of Essex plus Greater London east of the river Lea. Each location is identified by a 2 x 2km square, or tetrad, based on the even numbered grid lines of the National Grid. You can look up these locations on a map of Essex using the Location Finder.