The Brecon Beacons, or Bannau Brycheiniog ([ˈbanai̯ brəˈχəi̯njɔɡ] ), is a mountainous region and national park in Wales. The name 'Brecon Beacons' was originally applied only to the mountain range south of Brecon, Powys, which is now also known as the Central Beacons. The range includes South Wales' highest mountain, Pen y Fan (886 metres (2,907 ft)), its twin summit Corn Du (871 metres (2,858 ft)), and Craig Gwaun Taf (826 metres (2,710 ft)), which are the three highest peaks in the range.
The Brecon Beacons range and Fforest Fawr uplands form the central section of the national park, which has a total area of 1,344 square kilometres (519 sq mi). To the east are the Black Mountains, which extend into England, and to the west is the similarly named but distinct Black Mountain range. These ranges all share the same basic geology, such as a north-facing escarpment and glacial features such as lakes and cwms (cirques). The highest peak of the Black Mountains is Waun Fach (811 metres (2,661 ft)), and Fan Brycheiniog (802.5 metres (2,633 ft)) is the highest of the Black Mountain.
The national park was founded in 1957 and is the third and most recently-designated park in Wales, after Snowdonia and the Pembrokeshire Coast. It is visited by approximately 4.4 million people each year.