Mynydd Llangatwg

Mynydd Llangatwg or Llangattock Mountain is a hill in the Brecon Beacons National Park mostly in the county of Powys, south Wales but also extending into both Monmouthshire and Blaenau Gwent.

[1] Particular features of note include 'The Lonely Shepherd', an isolated limestone pinnacle which stands at the eastern tip of the plateau, left there by quarryworkers who removed great quantities of the surrounding rock.

Mynydd Llangatwg is formed from a layer cake of Palaeozoic Era sandstones and limestones which dip gently southwards into the South Wales Coalfield basin.

In contrast, the more poorly exposed sandstone forming the high ground of the centre of the hill is the lowermost Westphalian age Farewell Rock which marks the base of the South Wales Coal Measures.

Sections of the hill have a pock-marked appearance due to the dozens of shakeholes in its surface arising from the presence of the limestone beneath the sandstone cover, an example of interstratal karst.

Almost the entire hill is designated as urban common[3] and was mapped as open country under the provisions of the Countryside and Rights of Way Act 2000 and therefore freely available for walkers to roam at will.