Cwmwysg

The Usk Reservoir (Welsh: Cronfa Wysg) is located in the upper Usk Valley, at 1,006 feet (307 m) above sea level, in the western part of the Brecon Beacons National Park, Wales. The county boundary between Carmarthenshire and Powys runs through the reservoir which lies about six miles to the north of the Black Mountain escarpment. It is an important landmark for walkers on the mountain range.

Mynydd Bach Trecastell is a hill on the border between the counties of Carmarthenshire and Powys in southwest Wales. It lies within the Black Mountain range of the Brecon Beacons National Park and Fforest Fawr Geopark. Its summit is plateau-like and reaches a height of 412m at OS grid ref SN 827312 at Y Pigwn. The name signifies the 'little hill of castle town'.

Waun-Ddu is a part of the Mynydd Bach that is a Site of Special Scientific Interest in Carmarthen & Dinefwr, Wales.

Babel is a hamlet in Carmarthenshire, Wales.

Mynydd Myddfai is a hill 4.5 miles southeast of Llandovery in the county of Carmarthenshire, southwest Wales. It lies within the Brecon Beacons National Park and Fforest Fawr Geopark. The hill is in the form of a broad ridge aligned southwest to northeast with three or four distinct tops separated by cols. The northwest side drops steeply away towards the village of Myddfai whilst the other side is a more shallow slope down towards Glasfynydd Forest which encircles Usk Reservoir. The plateau surface of the hill rises to a height of 440m at OS grid ref SN 806297 where a trig point has been erected.

Crychan Forest Tracks is a Site of Special Scientific Interest in Carmarthen & Dinefwr, Wales. It was chosen as a special stage in the British Rally from 2006 to 2008.

Trefawr Track, a forestry road north of Cwm-coed-Aeron Farm, Llandovery, Wales, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the boundary between the Rhuddanian and Aeronian stages of the Silurian period on the geologic time scale. The GSSP was ratified in 1984. The boundary is defined as the first appearance of the graptolite Monograptus austerus sequens (the base of the Monograptus triangulatus biozone). The section is primarily mudstone, which yields an abundance of shelly faunas. The graptolite Diplograptus elongatus occurs immediately below the boundary.

The Llandovery transmitting station is a telecommunications facility located to the north of Llandovery and east of Cynghordy, in Carmarthenshire, Wales. It has a self-supporting 40 m lattice mast erected on land that is itself about 312 m above sea level. The site was originally built by the IBA, entering service in 1968 transmitting the now-defunct 405-line VHF television system. As well as providing an ITV service to the town of Llandovery some 8 km to the south west the site also transmitted to the north east, primarily to provide a link-signal for the ITV transmitter at Llandrindod Wells. The north easterly transmission also provided the ITV service to the villages of Llanwrtyd Wells and Llangammarch Wells. When UHF 625-line colour TV came to mid Wales in the 1970s the Llandovery locality was covered by the main transmitter at Carmel and so this site was not needed as a repeater. The villages of Llanwrtyd Wells and Llangammarch Wells were subsequently covered by a UHF relay station at Llanwrtyd Wells which came into service in the early 1980s. The nearest UHF relay to the Llandovery site is at Cilycwm 5.4 km to the west. 405-line television from Llandovery was shut down in January 1985.

Perfedd was a hundred, a geographic division, in the traditional county of Carmarthenshire, Wales. Its name derives from the Latin word permedium meaning "inner part".

St Michael's Church is the Anglican parish church for the parish of Myddfai, south of Llandovery, in Carmarthenshire, Wales. The present building dates from the 14th and 15th centuries with restoration work being undertaken in 1874, when a bellcote was added, and again in 1926. The church has a double nave and twin parallel roofs. The south nave may be the oldest part of the church and dates to the fifteenth century. The interior of the church has original plaster-panelled roofs with moulded timber ribs throughout the building. The church was designated as Grade I-listed building on 7 August 1966, as a fine example of "a largely complete medieval church of a scale and detail unexpected in so rural a location. Unusually intact interior including arcades, complete surviving late medieval roofs and the extensive survival of late medieval window tracery. The double nave form is relatively rare in the county, being more common in Powys".

Llanddeusant is a community in the Black Mountain Range of the Brecon Beacons National Park in Carmarthenshire, Wales. It is about 5 miles southeast of Llangadog. Llanddeusant lies within the Llansadwrn & Llangadog / Myddfai & Llanddeusant ward, which had a population of 2,412 at census 2001. The boundaries were changed and most of the population was shown under the Llangadog community. The remaining population at the 2011 census was 220 only. The name, meaning "church of two saints", is supposed to originate from the fact that Teilo and Saint David are believed to have met there. The 'Old Red Lion Inn' is now a Youth hostel. The community includes the hamlet of Twynllanan.

Myddfai () is a small village and community in Carmarthenshire, Wales. It is situated south of Llandovery in the Brecon Beacons, and has a population of 415, decreasing to 398 at the 2011 census. The village is a popular tourist destination on the western edge of the Brecon Beacons, famous for the history and heritage of the Physicians of Myddfai and the legend of ‘The Lady of The Lake’ and provides a central location to visit a wide range of interesting places, such as gardens, castles and The Heart of Wales Railway. The community is bordered by the communities of: Llanddeusant; Llangadog; Llansadwrn; Llanwrda; Llandovery; and Llanfair-ar-y-bryn, all being in Carmarthenshire; and by Llywel in Powys.