Corn Du

Corn Ddu is a mountain immediately to the southwest of Pen y Fan and the second highest peak in South Wales, situated in the Brecon Beacons National Park. Tommy Jones' Obelisk is found on its western flanks, in between the summit and Y Gyrn. The summit is very similar to that of Pen y Fan: flat and anvil shaped. It is marked by a large cairn. The summit is often crossed on the way to Pen y Fan. It offers good views down into Cwm Llwch and across the Usk valley to Brecon.