Claim: The South Wales Valleys stretch to western Monmouthshire.

The South Wales Valleys -LRB- Cymoedd De Cymru -RRB- are a number of industrialised valleys in South Wales . Commonly referred to locally as The Valleys -LRB- Y Cymoedd -RRB- , 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 . Many of the valleys run roughly parallel to each other . The Rhondda Valleys and the Cynon Valley are located roughly in the centre .