Llwyn-on Reservoir

Daren Fach is a Site of Special Scientific Interest in Merthyr Tydfil, south Wales.

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 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.

Mynydd-y-glog is a hill just east of the village of Penderyn in the northern corner of the county borough of Rhondda Cynon Taff in south Wales. It lies within the Brecon Beacons National Park and Fforest Fawr Geopark. Its summit plateau rises to a height of 389m / 1277 ft at OS grid ref SN 982088, a spot marked by a trig point. To its north lies the partly dry valley of Pant Sychbant which forms the eastern extension of Cwm Cadlan. Its southern slopes are drained by various streams which feed into the Afon Cynon.

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

Bryncarnau Grasslands, Llwydcoed is a Site of Special Scientific Interest in Llwydcoed near Aberdare, south Wales.

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.

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

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.