The South Wales Valleys go all the way to northern Monmouthshire .
Commonly referred to locally as The Valleys ( Y Cymoedd ) , they stretch from eastern Carmarthenshire in the west to Northern 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 .
South Wales Valleys