Derek looks back at his favourite valleys walks taking in beautiful paths in the Rhondda Valley and Merthyr Tydfil. To help celebrate the BBC Wales Real Valleys season, Derek Brockway dips into the Weatherman Walking archives to choose his top two walks in the South Wales Valleys. His first pick is a wonderfully wild walk through beautiful Blaencwm in the Rhondda Valleys, followed by a fascinating route around the old industrial areas around Merthyr Tydfil and up into the hills beyond.