Y Gyrn is a top of Pen y Fan in South Wales, situated in the Brecon Beacons National Park. Tommy Jones' Obelisk is found in between the summit and Corn Du.
The summit is a boggy mound overlooking the A470 and the Storey Arms. It is marked by a pile of stones.Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. .
External links www.geograph.co.uk : photos of Pen y Fan and surrounding area
References
cy:Pen y Fan