Craig Cerrig-gleisiad

A national nature reserve managed by Natural Resources Wales (NRW) for its glacial landforms — cliffs, moraines and landslips — and its mountain flora and fauna.

OS grid ref SN 965221 (centre of site)

This mountain-side is prominent in views up Glyn Tarell.  It is a comparatively easy walk from the road into the cwm below the main cliffs from which point the atmosphere of the place can be savoured.  Rocks of the Senni Formation of the Old Red Sandstone form impressive vegetated cliffs below which are the equally impressive moraines and landslip deposits which are a legacy of the last Ice Age.  A network of paths here and up onto nearby Fan Frynych provide for several walk options.


  • Old Red Sandstone (Devonian); Senni Formation
  • Quaternary; glacial cirque & moraines, landslip


  • OS Landranger 160, Explorer map OL12
  • Geological — BGS 1:50,000 sheet: 213 ‘Brecon’


  • Free NRW leaflet available on site


  • Picnicking, interpretive display at start
  • Free car parking in lay-by at SN 972223
  • Entry: free


  • Open country; steepish, uneven paths; 75m / 250’ ascent into cwm; mountain environment — take care!

Transport links

  • By car — beside A470
  • By train — nearest stations are at Llandovery, Merthyr Tydfil and Abergavenny — see Traveline Cymru
  • By bus — see Traveline Cymru; T4 service between Cardiff & Brecon

Other Geopark attractions nearby