South East Wales in the context of "Regions of Wales"

Cardiff (/ˈkɑːrdɪf/ ; Welsh: Caerdydd [kairˈdiːð, kaːɨrˈdɨːð] ) is the capital and largest city of Wales. Cardiff had a population of 383,919 in 2024 and forms a principal area officially known as the City and County of Cardiff (Welsh: Dinas a Sir Caerdydd). The city is the eleventh largest in the United Kingdom. Located in the southeast of Wales and in the Cardiff Capital Region, Cardiff is the county town of the historic county of Glamorgan and in 1974–1996 of South Glamorgan. It belongs to the Eurocities network of the largest European cities. A small town until the early 19th century, its prominence as a port for coal when mining began in the region helped its expansion. In 1905, it was ranked as a city and in 1955 proclaimed capital of Wales. The Cardiff urban area covers a larger area outside the county boundary, including the towns of Dinas Powys and Penarth.

Cardiff is the main commercial centre of Wales as well as the base for the Senedd, the Welsh Parliament. At the 2021 census, the unitary authority area population was put at 362,400. The population of the wider urban area in 2011 was 479,000. In 2011, it ranked sixth in the world in a National Geographic magazine list of alternative tourist destinations. It is the most popular destination in Wales with 21.3 million visitors in 2017. It was voted as the best city in the UK at the 2023 Readers' Choice Awards.

Monmouthshire (/ˈmɒnməθʃər, ˈmʌn-, -ʃɪər/ MON-məth-shər, MUN-, -⁠sheer), also formerly known as the County of Monmouth (/ˈmɒnməθ, ˈmʌn-/ MON-məth, MUN-; Welsh: Sir Fynwy), was one of the thirteen counties of Wales that existed from 1536 until their abolition in 1974. Located in the south-east of Wales, on the border with England, its area now corresponds approximately to the present principal areas of Monmouthshire, Blaenau Gwent, Newport and Torfaen, and those parts of Caerphilly and Cardiff east of the Rhymney River.

The eastern part of the county was mainly agricultural, while the western valleys had rich mineral resources. This led to the area becoming highly industrialised with coal mining and iron working being major employers from the 18th century to the late 20th century. Its five largest towns were Newport, Cwmbran, Pontypool, Ebbw Vale and Abergavenny.

The Cardiff Capital Region (CCR; Welsh: Prifddinas-Ranbarth Caerdydd) is a city region in Wales, centred on the capital city of Wales, Cardiff, in the southeast of the country. It is a partnership between the ten local authorities of Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Merthyr Tydfil, Monmouthshire, Newport, Rhondda Cynon Taf, Torfaen, and the Vale of Glamorgan, local businesses in southeast Wales and other organisations. The regional city deal is funded by the UK Government and Welsh Government. The Cardiff Capital Region includes the cities of Cardiff and Newport, and most of the South Wales Valleys, with the region being coterminous with the area defined as South East Wales.

Monmouthshire (/ˈmɒnməθʃər, ˈmʌn-, -ʃɪər/ MON-məth-shər, MUN-, -⁠sheer; Welsh: Sir Fynwy) is a county in the south east of Wales. It borders Powys to the north; the English counties of Herefordshire and Gloucestershire to the north and east; the Severn Estuary to the south, and Torfaen, Newport and Blaenau Gwent to the west. The largest town is Abergavenny, and the administrative centre is Usk.

The county is rural, although adjacent to the city of Newport and the urbanised South Wales Valleys. It has an area of 330 square miles (850 km) and a population of 94,930. Abergavenny is located in the north-east, and Usk in near the centre; other settlements include Monmouth in the east, Chepstow in the south-east, Caldicot in the south. Monmouthshire County Council is the local authority. Monmouthshire was established in 1996 and is named after the historic county of the same name, of which it covers approximately the eastern three-fifths. The county has one of the lowest percentages of Welsh speakers in Wales, at 8.2% of the population in 2021.

South Wales (Welsh: De Cymru [ˌdeː ˌkəmri]) is a loosely defined region of Wales bordered by England to the east and mid Wales to the north. Generally considered to include the historic counties of Glamorgan and Monmouthshire, south Wales extends westwards to include Carmarthenshire and Pembrokeshire. In the western extent, from Swansea westwards, local people would probably recognise that they lived in both south Wales and west Wales. The Brecon Beacons National Park covers about a third of south Wales, containing Pen y Fan, the highest British mountain south of Cadair Idris in Snowdonia.

A point of some discussion is whether the first element of the name should be capitalised: 'south Wales' or 'South Wales'. As the name is a geographical expression rather than a specific area with well-defined borders, style guides such as those of the BBC and The Guardian use the form 'south Wales'. The Welsh Government, in their international gateway website, Wales.com, state that it should always be capitalised; however, they use the term to refer to a tourism marketing area which excludes the Swansea and Neath Port Talbot local authority areas (placing them in 'West Wales'). In contradiction, the style guide for the Welsh Government's main website, Gov.wales, uses 'south Wales'. It is always capitalised on motorway signs.

The Vale of Glamorgan (Welsh: Bro Morgannwg [ˈbroː mɔrˈɡanʊɡ]), locally referred to as The Vale, is a county borough in the south-east of Wales. It borders Bridgend County Borough to the west, Cardiff to the east, Rhondda Cynon Taf to the north, and the Bristol Channel to the south. With an economy based largely on agriculture and chemicals, it is the southernmost unitary authority in Wales. Attractions include Barry Island Pleasure Park, the Barry Tourist Railway, Medieval wall paintings in St Cadoc's Church, Llancarfan, Porthkerry Park, St Donat's Castle, Cosmeston Lakes Country Park and Cosmeston Medieval Village. The largest town is Barry. Other towns include Penarth, Llantwit Major, and Cowbridge. There are many villages in the county borough.

Blaenau Gwent (/ˌblaɪnaɪ ˈɡwɛnt/; Welsh: [ˈbləi.nai]) is a county borough in the south-east of Wales. It borders the unitary authority areas of Monmouthshire and Torfaen to the east, Caerphilly to the west and Powys to the north. Its main towns are Abertillery, Brynmawr, Ebbw Vale and Tredegar. Its highest point is Coity Mountain at 1,896 feet (578 m).

Torfaen (/tɔːrˈvaɪn/; [tɔrˈvaɪn]) is a county borough in the south-east of Wales. Torfaen is bordered by the county of Monmouthshire to the east, the city of Newport to the south, and the county boroughs of Caerphilly and Blaenau Gwent to the south-west and north-west. It is within the boundaries of the historic county of Monmouthshire, and between 1974 and 1996 was a district of Gwent, until it was reconstituted as a principal area in 1996.

Caerphilly County Borough (Welsh: Bwrdeistref Sirol Caerffili) is a county borough in the south-east of Wales. It is governed by Caerphilly County Borough Council.

Its main and largest town is Caerphilly. Other towns in the county borough are, Risca, Ystrad Mynach, Newbridge, Blackwood, Bargoed, New Tredegar and Rhymney.