Beneath Pen y Fan: Autumn Valleys, History & Views
Sun, Oct 12
|Craig Cerrig Gleisiad nature res. Lay-by
Step into the hidden side of the Brecon Beacons on a 9-mile circular walk of valleys, moorland, history, and sweeping mountain views.
Time & Location
Oct 12, 2025, 10:00 AM – 4:00 PM
Craig Cerrig Gleisiad nature res. Lay-by, Libanus, Brecon LD3 8NL, UK
About the event
Join us for a guided autumn walk in the heart of the Brecon Beacons, starting at 330 metres beneath the iconic peak of Pen y Fan. Our route begins by descending into the beautiful Glyn Tarell valley, crossing the Afon Tarell — its name meaning “spring source” in Welsh — in land now cared for by the National Trust.
We’ll follow the old 18th-century Turnpike road, once a steep stagecoach route before it was re-routed in 1831, before turning west to gradually climb through forest and fields onto open moorland. From here, we ascend Twyn Dylluan-ddu (493m), rewarded with far-reaching views across Mynydd Illtud Common and the surrounding high peaks, including Pen y Fan itself.
Our return route skirts the edge of the Craig Cerrig Gleisiad National Nature Reserve, a dramatic haven for wildlife and geology, before looping back to our starting point.
This circular 8-mile walk includes steady climbs but…
