Daren Fach

Cefn Cil Sanws is a hill in the Brecon Beacons National Park within the county borough of Merthyr Tydfil in south Wales. The summit at 460m above sea level is crowned by a trig point. The steep cliffs of Darren Fawr and Darren Fach defend its western side which drops down into Cwm Taf. A major limestone quarry is worked on the southeastern side of the hill. An unexpected feature at this altitude is Merthyr Tydfil Golf Course which extends high onto the eastern and southern slopes of the hill.

Llwyn-on Reservoir (or Llwyn Onn Reservoir) is the largest and southernmost of the three reservoirs in the Taf Fawr valley in South Wales. Cardiff Corporation Waterworks obtained an Act of Parliament in 1884 to authorise construction of the reservoirs, to increase the water supply for Cardiff, but construction of Llwyn-on Reservoir did not start until 1911 and was completed in the 1920s. The reservoir, which has been owned and managed by Welsh Water and its predecessor organisation, the Welsh Water Authority, since 1973, is located within the Brecon Beacons National Park with its eastern half in the Merthyr Tydfil unitary authority area and the western half in Rhondda Cynon Taf. The village of Llwyn-On is nearby and the A470 trunk road runs along its eastern shoreline.

Penmoelallt or Onllwyn is a hill in the northern part of the county borough of Rhondda Cynon Taff in south Wales. It lies within the Brecon Beacons National Park and Fforest Fawr Geopark. To its east lies the deep valley of Cwm Taf and to its north a rather shallower valley in which the Nant Cadlan originates. To the west is the hill known as Mynydd-y-glog and to the south are slopes draining into the River Taff and the Afon Cynon. The hill culminates in a broken plateau with several knolls rising above the 420m contour. Its afforested nature makes it difficult to determine the precise location of its highest point but this probably lies somewhere around OS grid ref SO 003096. Older maps indicate a spot height of 1376 ft above sea level at SO 000090.

Cefn Coed railway station served the suburb of Cefn-coed-y-cymmer, Glamorgan, Wales, from 1867 to 1964 on the Brecon and Merthyr Tydfil Junction Railway.

The Nant Glais Caves are a collection of six caves located near Vaynor in Merthyr Tydfil County Borough, South Wales. The largest cave, Ogof Rhyd Sych, measures around 2000m long. The site has been designated a Site of Special Scientific Interest.

Cefn-coed-y-cymmer (pronounced [ˌkɛvɛnˌkɔi̯dəˈkəmɛr]) is a small community on the northwestern edge of Merthyr Tydfil County Borough in Wales. It is situated in the neck of land between the rivers Taf Fawr and Taf Fechan at their confluence (Welsh: 'cymer'). The village lies within the community of Vaynor. Immediately to the north of the village is the hill of Cefn Cil Sanws on the southern slopes of which is Merthyr Tydfil Golf Club. The village is bounded both to the north and the west by the Brecon Beacons National Park.Notable features of the village are the A465 Heads of the Valleys Road and the impressive curving Cefn Coed Viaduct. The viaduct, which spans the Taf Fawr river, came into being as part of the Merthyr- Pontsticill junction line. This additional line extended the Brecon and Merthyr Railway and was only agreed following a special Act of Parliament in July 1862 to allow its construction. The Cefn Coed Cemetery with its Jewish burial ground is listed on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

Vaynor and Penderyn High School was situated at Cefn Coed, Merthyr Tydfil in Wales. Although now part of Merthyr Tydfil, the area covered by the school was part of the old county of Brecknockshire (Breconshire) until local government reorganisation in 1974. The designated catchment area of the school was made up of the communities served principally by Ysgol y Graig Primary in Merthyr Tydfil and Penderyn and Hirwaun Primary Schools in Rhondda Cynon Taff, and is an area which suffers a high degree of economic deprivation. The school had an age range of 11-18 and a capacity of 455 places which would be small for a secondary school even if full. The School was opened by Robert Crawshay in 1861 but closed in 2005.

Cwm Taf Fechan Woodlands is a Site of Special Scientific Interest on the northern outskirts of Merthyr Tydfil, in south Wales. It has semi-natural broadleaved woodland, with a variety of plants, some of which are rare. The 60.9 hectares (150 acres) site under protection is dominated by oak, ash, downy birch, and hazel and hawthorn. The Taf Fechan river flows nearby.

Pontsarn Halt railway station served the village of Vaynor and the area of Pontsarn, Glamorgan, Wales, 1869 to 1961 on the Brecon and Merthyr Tydfil Junction Railway.

The Pont-y-Cafnau (Welsh, meaning bridge of troughs), sometimes written Pont y Cafnau or Pontycafnau, is a 14.2-metre (47 ft) long iron truss bridge over the River Taff in Merthyr Tydfil, Wales. The bridge was designed by Watkin George and built in 1793 for his employer, the Cyfarthfa Ironworks, to support both a tramway and an aqueduct to carry limestone and water into the works. A Grade II* listed building and Scheduled Ancient Monument, the Pont-y-Cafnau is the world's earliest surviving iron railway bridge.

Cyfarthfa is a community and electoral ward in the west of the town of Merthyr Tydfil in Merthyr Tydfil County Borough, Wales.

The Cyfarthfa Ironworks were major 18th- and 19th-century ironworks in Cyfarthfa, on the north-western edge of Merthyr Tydfil, in South West Wales.