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Mountain range in Wales

The Brecon Beacons (Bannau Brycheiniog; ) are a mountain range in Wales. The range includes South Wales's highest mountain, Pen y Fan , its twin summit Corn Du , and Craig Gwaun Taf , which are the three highest peaks in the range. The Brecon Beacons have given their name to the larger Brecon Beacons National Park, and the range itself is therefore sometimes known as the Central Beacons to differentiate the two.

The Brecon Beacons comprises six main peaks, which from west to east are: Corn Du, ; Pen y Fan, the highest peak, ; Cribyn, ; Fan y Bîg, ; Bwlch y Ddwyallt, ; and Waun Rydd, These summits form a long ridge, and the sections joining the first four form a horseshoe shape around the head of the Taf Fechan, which flows away to the southeast. To the northeast of the ridge, interspersed with long parallel spurs, are four cirques (Welsh: cymoedd, sing. cwm) or round headed valleys; from west to east these are Cwm Sere, Cwm Cynwyn, Cwm Oergwm and Cwm Cwareli. The Brecon Beacons range, Fforest Fawr, and Black Mountain form a continuous massif of high ground above 300 metres (1000 feet). The A470 road forms an approximate boundary between the central Beacons and Fforest Fawr.

The Brecon Beacons National Park was established in 1957, the third of the three Welsh parks after Snowdonia in 1951 and the Pembrokeshire Coast National Park in 1952. It covers an area of 519 square miles (1,344 km2), which is much larger than the Brecon Beacons range. Over half of the park is in the south of Powys; the remainder of the park is split between northwestern Monmouthshire, eastern Carmarthenshire, northern Rhondda Cynon Taf and Merthyr Tydfil, and very small areas of Blaenau Gwent, and Torfaen.

A railway with narrow gauge trains is run by the Brecon Mountain Railway. The railway is a 23.75 inches narrow gauge tourist railway on the south side of the Brecon Beacons range. It climbs northwards from Pant along the full length of the Pontsticill Reservoir (also called 'Taf Fechan' reservoir by Welsh Water) and continues past the adjoining Pentwyn Reservoir to Torpantau railway station. The railway's starting point at Pant is located north of Merthyr Tydfil town centre.

The Brecon Beacons are used for training members of the UK armed forces and military reservists. The Army’s Infantry Battle School is located at Brecon, and the Special Air Service (SAS) and Special Boat Service use the area to test the fitness of applicants. An exercise unique to the area is the 'Fan dance', which takes place on Pen y Fan. In July 2013 three soldiers died from overheating or heatstroke on an SAS selection exercise. An army captain had been found dead on Corn Du earlier in the year after training in freezing weather for the SAS.