Mynydd Myddfai and Usk Reservoir

Moorland rich in archaeological remains from Roman and Iron Age times. Abandoned tilestone workings stretch across the moor.

OS grid ref SN 828284

The moor straddles the boundary between the Old Red Sandstone rocks of the ‘classic’ Brecon Beacons and the older rocks of central Wales to the north and west. A line of pits dating from the 18th and 19th centuries marks the outcrop of the Tilestones which were widely used for roofing before North Wales slates arrived with the first railways.


  • OS Landranger 160, Explorer map OL12
  • Geological — BGS 1:50,000  sheet: 231 ‘Brecon’


  • Geotrail


  • Free car parking north and south of dam
  • Entry: free


  • Flat, barrier-free, hard-surfaced routes beside reservoir

Transport links

  • By car — on minor roads off A40 and A4069
  • By train — nearest station is Llandovery — see Traveline Cymru
  • By bus — see Traveline Cymru; nearest services on A40

Other attractions nearby