Hatterrall Ridge
The Hatterrall Ridge (sometimes spelled Hatterall) is a ridge in the Black Mountains forming the border between Powys and Monmouthshire in Wales and Herefordshire in England. The ridge is about 10 miles (16 km) long, and is followed by the Offa's Dyke Path. On the west side of the ridge is the Vale of Ewyas, and on the east side is the Olchon Valley. The western side of the ridge falls within the Brecon Beacons National Park.
The highest point on the ridge is Black Mountain (elevation 703 m), near its northern end. Hatterrall Hill (elevation 531 m) is near the southern end of the ridge. The hill is common land grazed by sheep, ponies and cattle.[1]
Geology
The hill is composed from sandstones and mudstones of the Senni Beds Formation of the Old Red Sandstone which is of Devonian age. Numerous small quarries adorn its slopes though all are now abandoned. The Vale of Ewyas to the south and west of the ridge was occupied by a glacier during the ice ages, though the plateau was probably ice-free.
The ridge is often used for paragliding and hang gliding when the wind is from the east or east-north-east.