The River Roding is a river in England that rises near Dunmow, flows through Essex and forms Barking Creek as it reaches the River Thames in London. In Essex the river forms part of the boundary between the district of Epping Forest and borough of Brentwood. The river marks much of the boundary between the London Borough of Newham and the London Borough of Barking and Dagenham.
This is wrong. The district boundaries are to the east of the River. The River does form the boundary between the Epping Forest and the Brentwood and Ongar parliamentary constituencies.