Black Mountains

The Black Mountains form a rugged range straddling the Wales–England border in the United Kingdom. Their Welsh heart lies in south-east Powys and north-west Monmouthshire, with a smaller English slice in western Herefordshire. The hills sit within a triangle marked by Abergavenny, Hay-on-Wye and Llangors, close to towns like Talgarth and Crickhowell. The Gospel Pass road climbs to the highest public route in Wales, cutting through the heart of the range. Waun Fach, at 811 metres, is the group’s summit, while Pen y Gadair Fawr and Black Mountain also top 800 metres. Outliers such as the Sugar Loaf and the Skirrid add to the skyline. Local summits shape the land and its stories. Hay Bluff and Lord Hereford’s Knob rise above the northern ridges, while Pen Cerrig-calch commands views over Crickhowell. The geology is almost all Old Red Sandstone from the Devonian period, with Carboniferous rocks only at Pen Cerrig-calch. Glacial ice from the Wye and Usk valleys shaped the lower slopes long ago, leaving moraines and reshaping cols. Landslips scar the eastern flanks, most notably around Darren and Cwmyoy, where the ground still moves slowly. Visitors walk the high plateau where Waun Fach’s peat summit stretches wide and flat. The Gospel Pass road offers a high traverse into Wales, while the valleys below carry the Grwyne Fawr and Grwyne Fechan rivers. The Sugar Loaf and Skirrid stand apart, their slopes covered in short mountain grass and heather. From the ridges, the land falls away to Hay-on-Wye and the Usk Valley, giving long views across farmland and woodland. The hills hold the names of old farms and farms, scattered among the rocks and streams.