Pen y Fan via Corn Du

Pen y Fan is the highest peak in southern Britain at 886m, rising above the Brecon Beacons National Park in Wales. The popular ascent via the twin summit of Corn Du (873m) begins at the Storey Arms car park on the A470, approximately 12km north of Merthyr Tydfil. No permit is required, but the car park charges a fee of around £5 per day and fills rapidly on summer weekends. The seasonal T4 Beacons Bus connects Brecon and Merthyr Tydfil to the trailhead for car-free visitors. The route covers 9.7km return with 580m of elevation gain, typically taking 3 to 4 hours at a comfortable pace. From Storey Arms, a well-worn stone-pitched path climbs steadily across open moorland before ascending a broad sandstone ridge to the flat plateau of Corn Du. A short descent and re-ascent leads to Pen y Fan's distinctive flat-topped summit. Terrain is predominantly grass and compacted earth on the lower slopes, transitioning to exposed sandstone rock and loose scree near the summits. The ridge offers little shade and no natural shelter; the plateau is subject to rapid weather changes. From Pen y Fan's summit, views extend across the Brecon Beacons to the Black Mountains in the east, the Carmarthen Fans to the west, and on clear days as far as the Bristol Channel and the Mendip Hills in England. The glacial hollows of Cwm Llwch and Cwm Sere flank the ridge, formed during the last ice age. Wild ponies roam the lower moorland year-round and Red Kites are frequently spotted riding thermals above the ridge. Streams on the approach provide water, but the plateau itself has no reliable sources above 700m. There are no refuge huts on this route; the Storey Arms car park has basic toilet facilities. Brecon Mountain Rescue covers this area and can be reached via the standard 999 emergency call. The return follows the same ridge route; experienced walkers can vary the descent via the Pen y Fan path toward Pont ar Daf to the east.