Henllys Vale

Trail visiting various pieces of industrial archaeology.

OS grid ref SN 755125

The valley of the Afon Twrch was home to industry in times past.  Follow the old tramway to see an impressive chimney which is virtually all that remains of Henllys Colliery.  Nearby are substantial limekilns. The strikingly straight course of a former tramway can be followed across the moors above these ruins to disused quarries.


  • Carboniferous; Coal Measures and Twrch Sandstone


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


  • Geotrail leaflet
  • Audio trail available for download.


  • Free car parking at Brynhenllys Bridge (SN 756126)
  • Entry: free
  • Accessibility: paths recently improved
  • Interpretive panel installed at limekilns
  • Caution: mountain environment beyond chimney & limekilns

Transport links

Other attractions nearby