Swansea Valley

Ystradgynlais (; ) is a town in southwest Powys, Wales. It is located on the River Tawe, and was within the boundaries of the former county of Brecknockshire. The town has a high proportion of Welsh language-speakers. The community includes Cwmtwrch, Abercraf and Cwmgiedd, with a population of 8,092 in the 2011 census; it is the second-largest town in Powys. It forms part of the Swansea Urban Area where the Ystradgynlais subdivision has a population of 10,248.

Pontardawe () is a town and a community in the lower Swansea Valley (). It had a population of approximately 7,172 in the 2021 Census for Pontardawe Parish, and forms part of the county borough of Neath Port Talbot.

thumb|240px|Swansea Canal Aqueduct at Ystalyfera Ystalyfera is a former industrial village and community in the upper Swansea Valley, on the River Tawe, about northeast of Swansea. It is an electoral ward and a community in the unitary authority of Neath Port Talbot, Wales, comprising a resident population of just over 3,000 people, approximately 60% of whom speak Welsh.

river in Wales, United Kingdom

town and community in Swansea, Wales

thumb|Abercrave Inn Abercraf (also ; or Abercrave) is a village in Powys, Wales, in the community of Ystradgynlais and within the historic boundaries of the county of Brecknockshire.

Cave system in Wales, United Kingdom

thumb|Cwmtwrch natural spring Cwmtwrch () is a village in the valley of the Afon Twrch, a right-bank tributary to the Swansea Valley, Wales, some 15 miles north of Swansea. It is also the name of an electoral ward to Powys County Council.

Alltwen (or Allt-wen; translates to "white wooded slope") is a village in the Swansea Valley (Welsh: Cwmtawe) in Wales. Alltwen forms part of the community of Cilybebyll and is administered separately from adjoining Pontardawe on the opposite bank of the River Tawe.