The South Wales Valleys are located in Wales.
Monmouthshire ( [ ˈmɒnməθʃər ] or [ ˈmɒnməθʃɪər ] ) , also known as the County of Monmouth ( [ ˈmɒnməθ ] Sir Fynwy ) , is one of thirteen historic counties of Wales and a former administrative county . South Wales ( De Cymru ) is the region of Wales bordered by England and the Bristol Channel to the east and south , and Mid Wales and West Wales to the north and west . The South Wales Valleys ( Cymoedd De Cymru ) are a number of industrialised valleys in South Wales . The Vale of Glamorgan , often referred to as The Vale , ( Bro Morgannwg [ ˈbroː mɔrˈɡanʊɡ ] ) is a county borough in Wales .