Afon Twrch

Ysgol Gymraeg Ystalyfera Bro Dur is a Welsh-medium comprehensive school in Neath Port Talbot, Wales. The school provides education to three to eighteen-year-old pupils in Neath Port Talbot and south Powys from three campuses in Ystalyfera and Port Talbot.

Ystalyfera is a former industrial village and community in the upper Swansea Valley, on the River Tawe, about 13 miles (21 km) 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. National Cycle Route 43 passes through the village.

Ystalyfera railway station served the village of Ystalyfera, in the historical county of Glamorganshire, Wales, from 1861 to 1950 on the Swansea Vale Railway.

The Swansea Valley (Welsh: Cwm Tawe; lit. 'Tawe Valley') is one of the South Wales Valleys. It is the valley from the Brecon Beacons National Park to the sea at Swansea of the River Tawe in Wales. Administration of the area is divided between the City and County of Swansea, Neath Port Talbot County Borough, and Powys. A distinction may be drawn between the Lower Swansea valley and the Upper Swansea valley; the former was more heavily industrialised during the 19th and 20th centuries.

Ystradgynlais Community Hospital (Welsh: Ysbyty Cymunedol Ystradgynlais) is a health facility in Glanrhyd Road, Ystradgynlais, Powys, Wales. It is managed by the Powys Teaching Health Board.

Ynyscedwyn Ironworks is an industrial complex located in Ystradgynlais, near Swansea, Wales. Smelting was first established here in seventeenth century. In the 1820s, with the arrival of George Crane, production was expanded. Crane was the first ironmaster who successfully tried anthracite to a blast furnace in 1837. In 1837, London bankers, Charles Price and Joseph Marryat, invested in the Ynyscedwyn Ironworks. The remaining structures were built in 1872 to house a planned steel mill. Although not completed, the site housed the Ynyscedwyn Tinplate Works.

The Gleision Colliery mining accident was a mining accident which occurred on 15 September 2011 at the Gleision Colliery, a drift mine at Cilybebyll in Neath Port Talbot, in Wales. The accident occurred while seven miners were working with explosives on a narrow coal seam. Following a blasting operation into a separate disused flooded mine network to increase air-circulation, the tunnel in which the miners were working began to fill with water. Three of the miners escaped, with one being taken to hospital with life-threatening injuries, while the others were trapped underground. A search and rescue operation was launched to locate the four remaining miners, but they were found deceased the following day. The incident is the worst mining disaster to occur in Wales for three decades.

Mynydd Allt-y-grug is a 338-metre-high hill immediately west of Ystalyfera in the county borough of Neath Port Talbot in South Wales. Its twin summits are around 400m apart. The upper part of the hill is largely covered in heather whilst conifers clothe its western slopes and gorse, bracken and bramble cover much of its rough landslide eastern side which rises above the Swansea Valley, drainage on this side flowing to the River Tawe.

Godre'r Graig is a village and an electoral ward of Neath Port Talbot county borough, Wales. The village developed alongside the coal workings at the Tarenni Colliery, which closed in 1949. In 2008 the community came together at a public meeting held in the local primary school regarding the long neglected park. As a result, Godre'r Graig Community Association (GCA) was formed to provide a vehicle for the community to take charge of the park and bring it back into use.

Ystradgynlais railway station served the town of Ystradgynlais in the traditional county of Breconshire, Wales. Opened in 1873 by the Swansea Vale and Neath and Brecon Junction Railway, it was eventually absorbed by the Midland Railway and it closed to passengers in 1932 although the line through the station remained open for freight for some time after that.

The Tarenni Colliery (Welsh: Gloddfa Tarenni) and its associated workings, are a series of coal mines and pits located between the villages of Godre'r Graig and Cilybebyll located in the valley of the River Tawe, in Neath Port Talbot county borough, South Wales.

The River Giedd (Welsh: Afon Giedd) is a principal tributary of the River Tawe, Wales. The river runs within the county of Powys and lies almost wholly within the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog). This river is perhaps unique in the British Isles in that there are in fact two separate rivers sharing the same name and occupying the same valley but which are not hydrologically connected. The upper Giedd rises on the southern slopes of the Old Red Sandstone mountain, Fan Brycheiniog in the Black Mountain (Y Mynydd Du) and heads south-southwest for about 3 km / 2 mi until, as it enters onto the Carboniferous Limestone outcrop it disappears into its bed. A dry valley continues in the same direction beyond the sinks and, as it crosses the Millstone Grit outcrop, gradually acquires a stream which is joined by others to become the lower Giedd. This separate river flows for about 6 km / 4 miles, passing the small village of Cwmgiedd, to its confluence with the River Tawe at Ystradgynlais in the Swansea Valley. Dye tracing in 1970 revealed that the waters of the upper Giedd which disappear into the ground at Sinc y Giedd eventually re-emerge at Dan-yr-Ogof and do not contribute in any way to the flow of the lower Giedd. The only significant tributary of the River Giedd is the Nant Cyw (translates as 'chick stream') entering on its left bank and whose two tributaries are in turn, the Nant Iar ('hen stream') and Nant Ceiliog ('cockerel stream').