About Black Mountain
Rising above the book-town of Hay-on-Wye, this expansive, peat-covered ridge marks the border between Wales and England. As the highest point in Herefordshire, it offers a steady, long-distance walk along the Offa’s Dyke Path, with wide-reaching views over the Vale of Ewyas and the neighbouring ridge of Lord Hereford’s Knob.
Key Statistics
Rank
20th Highest in Wales
Parent Range
Data coming soon
Nearest Town
Craswall
Prominence
?
155
Geology
You’re trekking across the Senni Formation, a sturdy foundation made of alternating layers of sandstone and fine, muddy rock.
Did You Know?
- •The name Black Mountain refers to this specific ridge, while the wider range is the Black Mountains. The summit itself is often called Twyn y Llech, Welsh for 'hillock of the slab'. The 'black' designation likely comes from the dark, brooding appearance of the heather and peat against the skyline when viewed from the lowlands.
- •This summit serves as the highest point in the English county of Herefordshire. While the border with Powys runs directly through the ridge, the highest ground provides a rare English 700-metre peak situated outside of the northern moorlands and the Lake District.
- •The ridge is a key section of the Offa’s Dyke Path, a National Trail following the 8th-century earthwork. It offers a remarkably level high-altitude walk, looking down into the deep, glacial trench of the Vale of Ewyas where the ruins of Llanthony Priory sit.
- •From the plateau, the view south-west picks out the distinctive flat-topped silhouettes of Pen y Fan and Corn Du. To the north-west, the vista opens up towards the Radnorshire Hills and the distant, rugged profile of Cadair Idris on a clear day.
- •Navigating the summit plateau in mist requires a keen eye; the top is so broad and flat that the highest point is barely indistinguishable from the surrounding bog, marked only by a modest cairn that seems almost apologetic for its own lack of drama.
Find It
Latitude
52.0119°N
Longitude
3.0866°W