Pen y Fan Pen y Fan Pen y Fan () is the highest peak in south Wales, situated in the Brecon Beacons National Park. At above sea-level, it is also the highest British peak south of Cadair Idris in Snowdonia. 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'. The mountain and surrounding area are owned by the National Trust whose work parties attempt to combat the erosion caused by the passage of thousands of feet up and down this most popular of South Wales' peaks. The
Pen y Garn Pen Pumlumon Arwystli. 21 km to the west is the town of Aberystwyth; Drygarn Fawr lies 20 km to the SSE . Pen y Garn Pen y Garn is a mountain in the Cambrian Mountains, Mid Wales standing at 611 metres above sea level. Pen y Garn tops a 500–600 m high plateau, situated on which is the controversial Cefn Coch wind farm. The summit contains a very large shelter cairn hollowed out from the remains of an ancient burial cairn. The summit also has a trig point. The wind turbines are very near the summit. To the north some