Beneath the streets of Croydon there runs a river buried by the built-up borough, but still flowing in secret.The nine-mile-long River Wandle meanders through Sutton, Merton and Wandsworth before emptying out into the Thames.In these boroughs there are leafy riverbanks where the path of the ancient waterway can be easily followed.But the Wandle also flows through Croydon, and in fact begins its journey to the Thames in the heart of the borough.READ MORE: Croydon will be hotter than tourist...
