The Ravensbourne

Not to be confused with the River Ravensbourne

From the Wikipedia page on the River Rom

The Ravensbourne is a tributary which rises to the NNE in Ardleigh Green (part of the Hornchurch post town and flows through two green suburbs of Romford and Hornchurch: Emerson Park and Harrow Lodge Park, before joining the Beam at Eastbrookend Country Park.