Corn Du the last ice age by ice scouring out hollows below the peaks, the water being partly dammed by moraines of rock debris carried down by ice action subsequent to plucking and frost shattering. Corn Du Corn Du is a mountain immediately to the southwest of Pen y Fan and the second highest peak in South Wales at 873 m (2,864 ft), situated in the Brecon Beacons National Park. The summit itself is marked by a well structured Bronze Age cairn with a central burial cist like that on nearby Pen y Fan. The two summits are visible from great distances
Pen Ty-Nant begins in Rhyd-uchaf and takes approximately 45 mins for a round trip. Alternatively a bridle path leads here from Bala. The summit is unmarked on open farmland. Pen Ty-Nant Pen Ty-Nant () is a hill within the Snowdonia National Park in Gwynedd, North Wales. Pen Ty-Nant is a member of the Arenig range, just from the small hamlet of Rhyd-uchaf and from Bala. Its parent peak Arenig Fawr is approximately to the west. It is a continuation of a small ridge that begins just to the northwest of Bala and ends at Moel y Garnedd on moorland known as the