Pen y Fan

At 886m, Pen y Fan is the highest peak in South Wales and it is situated in Bannau Brycheiniog National Park (Brecon Beacons).
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The twin summits of Pen y Fan and Corn Du at 873 m (2,864 ft) were formerly referred to as Cadair Arthur or 'Arthur's Seat'.
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The summit is marked by a well preserved and structured Bronze Age cairn with a central stone cist.