Twyn Llech, also known as Black Mountain, is a mountain in the Black Mountains to the west, or the Black Hill about 2 km to the east). It is the only Marilyn to fall exactly on the Welsh–English border, straddling Powys and Herefordshire. Its parent peak, Waun Fach, lies to the west.
The Black Mountain is the highest point on Hatterrall Ridge. Offa's Dyke Path passes along the ridge, more or less from south to north. A steeper path leads to the summit from near the former youth hostel in the Vale of Ewyas to the west. The summit is unmarked and, because of the very shallow gradients along the summit ridge, virtually impossible to determine in situ. Open access to all the moorland here means that deviation from the paths is allowed. The ground is peaty and normally very wet even in good weather, especially on the highest ground.
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County of Herefordshire