The South Wales Valleys are also referred to as Y Cymoedd.
The South Wales Valleys ( Cymoedd De Cymru ) are a number of industrialised valleys in South Wales . Commonly referred to locally as The Valleys ( Y Cymoedd ) , they stretch from eastern Carmarthenshire in the west to western Monmouthshire in the east and from the Heads of the Valleys in the north to the edge of the lower-lying , pastoral country of the Vale of Glamorgan and the coastal plain around Swansea Bay , Bridgend , the capital Cardiff , and Newport .