South Wales (Welsh: De Cymru) is an area 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 most densely populated region in the south-west of the U.K., it is home to around 2.1 million people and includes the capital city of Cardiff (population approximately 317,500) and two other cities, Swansea and Newport. There is one national park in the region called the Brecon Beacons which covers about a third of South Wales, in which is located the highest mountain south of Snowdon, North Wales, namely Pen Y Fan.

The extent of South Wales is loosely defined, but it is generally considered to be the area surrounding the M4 motorway, including the counties of Glamorganshire and Monmouthshire and sometimes extending westwards to include south Carmarthenshire and south Pembrokeshire. In the western extent, from Swansea westwards, local people would probably recognise that they lived in both South Wales and in West Wales - there is considerable overlap in these somewhat artificial boundaries. The northern border is particularly ill-defined, but the A40 may be a good approximation whilst others consider the more southerly Heads of the Valleys Road as the boundary.

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