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Caeau Heol y Llidiart-coch is a Site of Special Scientific Interest in Carmarthenshire, Wales. The site is of special interest for its marshy grassland, fen meadow, and areas of species-rich grasslands. The site lies within Brecon Beacons National Park.

Trichrug (also referred to as Pen-y-bicws) is a hill four miles east of Llandeilo and 3 miles south of Llangadog in the county of Carmarthenshire, southwest Wales. It lies within the Brecon Beacons National Park and Fforest Fawr Geopark. Its summit at a height of 415m above sea level is marked by a trig point. It is a Marilyn with a prominence of 191 metres.

The South Wales Traverse is a long distance fell running challenge across the mountains of south Wales. It is a linear route of around 120 kilometres (75 mi) taking in some 31 summits over 610 metres (2,000 ft) high, providing around 5,500 metres (18,000 ft) of ascent. The aim is for challengers to complete the route on foot within 24 hours. The route takes in the mountain ranges of the Black Mountain, Carmarthenshire Fans, Fforest Fawr, Central Brecon Beacons, and the Black Mountains, across most of the Brecon Beacons National Park. The selection of summits that must be visited is simply all peaks standing at over 610 metres (2,000 ft). Arguably, some of the peaks are points along the ridges rather than true summits in their own right but some consider this to add to the theme of a linear long distance challenge. Challengers may start at either end, but traditionally it is run from west to east so that both the prevailing wind can be from behind and 60% of the ascent can be completed in the first half. The Traverse is considered by many who have completed it to be the Southern Britain equivalent of rounds like the Bob Graham. However, it has seen far fewer successful completions than these rounds (around 40 finishers by October 2020), due to the relatively low numbers of challengers who attempt it each year. The fastest men's time for the Traverse is 14 hours 13 minutes by Damian Hall on 15 October 2020. The women's record is held by Helen Brown with a time of 18 hours 48 minutes set on 26 September 2020.The challenge is used to be referred to as the "Brecon Beacons Traverse", but this only cites the relatively short section from Storey Arms to Talybont over the Central Beacons failing to recognise the wider significance of the challenge.

Bont Fawr is a tiny hamlet in Carmarthenshire, Wales.

The Cwm Llwyd Fault is a fault in the west of the Black Mountain of South Wales. It runs north, parallel to the A4069 road, for over 4 km from near Brynaman to meet the Carreg Cennen Disturbance near Brest Cwm Llwyd. It moved as a sinistral (left lateral) strike-slip fault during the Variscan Orogeny. Together with the Llwyn Celyn Fault it formed a left-stepping offset that created a pull apart structure, which preserved the Cwm Llwyd Outlier of Namurian rocks.

Y Garn Goch is a hill in the Brecon Beacons National Park in the east of Carmarthenshire, Wales. The name means the 'red cairn'. It lies near the village of Bethlehem, three miles southwest of Llangadog and four miles east of Llandeilo on the southern side of the broad Towy Valley. It is also commonly known as either Garn Goch or Carn Goch. Current owners and land managers are the Brecon Beacons National Park Authority.

Tair Carn Uchaf (Welsh for 'Upper Three Cairns') is a hill in the Brecon Beacons National Park (Welsh: Parc Cenedlaethol Bannau Brycheiniog) in the county of Carmarthenshire, Wales. Its summit sits atop a plateau-like ridge at 482 metres (1,580 ft) above sea level and is marked by one of the three huge cairns which give the mountain its name. The main ridge leads southwest towards the subsidiary top of Tair Carn Isaf ("Lower Three Cairns", 51.8344°N 3.9113°W / 51.8344; -3.9113 (Tair Carn Isaf)), which hosts further cairns. The summit of this top lies at 460 metres (1,510 ft), whilst a trig point just to its southwest lies at a height of 459 metres (1505'). To the south of the main ridge lies the subsidiary peak of Drysgol which reaches a height of 393 metres (1,290 ft).

Llangadog () is a village and community in Carmarthenshire, Wales, which also includes the villages of Bethlehem and Capel Gwynfe. A notable local landscape feature is Y Garn Goch with two Iron Age hill forts.Llangadog was the administrative centre of the commote of Perfedd and had a castle, destroyed in 1204. Although the borough declined in the Middle Ages, Llangadog retained its market, which was frequented by drovers into the 19th century. The railway station on the Heart of Wales Line provides regular train services via Transport for Wales Rail. The station had a siding for accessing the Co-op Wholesale Society creamery, allowing milk trains to access the site. After railway access was ceased in the late 1970s, the creamery continued to operate until 2005, when it closed with the loss of 200 jobs. The site has since been redeveloped as a pet food factory.

Bethlehem is a tiny farming village in the county of Carmarthenshire, Wales, lying in the Tywi Valley northeast of Llandeilo and southwest of Llangadog but on the opposite side of the river from the busy London to Haverfordwest road, the A40. The centre of the village is approximately in front of the six houses opposite the village hall, with other houses, the Primary School, and a former Post Office scattered up and down the hill. The Nonconformist chapel after which the village was named is on a side road that follows the western edge of the Brecon Beacons.

West Glamorgan (Welsh: Gorllewin Morgannwg) is a former administrative county in South Wales. It is now a preserved county. West Glamorgan was one of the divisions of the ancient county of Glamorgan. It was created on 1 April 1974, by the Local Government Act 1972 from the county borough of Swansea, the municipal boroughs of Neath and Port Talbot, the urban districts of Glyncorrwg and Llwchwr, Gower Rural District, Pontardawe Rural District, and all of Neath Rural District except the parish of Rhigos. From 1982, the main offices of West Glamorgan County Council were located in County Hall, Swansea. West Glamorgan had four districts, as follows: Swansea – Swansea CB and Gower RD Lliw Valley – Llwchwr and Pontardawe RD Neath – Neath and Neath RD Port Talbot – Port Talbot and GlyncorrwgFollowing the Local Government (Wales) Act 1994, West Glamorgan and its component districts were abolished on 1 April 1996, the area being divided into the two unitary authorities of Swansea and Neath and Port Talbot (later changed to "Neath Port Talbot"). Lliw Valley was partitioned between the two authorities. A West Glamorgan preserved county was created for the limited functions of Lieutenancy and High Shrievalty.

Quarter Bach (Welsh: Cwarter Bach) is a community located in the east of Carmarthenshire, Wales.

The Afon Sawdde is a river in the county of Carmarthenshire, Wales. For most of its course it flows through the Brecon Beacons National Park and Fforest Fawr Geopark.