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Ogof Agen Allwedd

Ogof Agen Allwedd or Agen Allwedd, is, at 20.2 miles (32.5 km), one of the longest cave systems in Wales, and the longest cave system on the Llangattock escarpment.

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Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

More caves in United Kingdom

  1. Mossdale Caverns76 m deep
  2. Dan yr Ogof17 km
  3. Swildon's Hole9.1 km
  4. St Cuthbert's Swallet7.1 km
  5. Wookey Hole Caves3.7 km

Other notable caves worldwide

  1. Mammoth Cave · Australia686 km
  2. Sistema Sac Actun · Mexico119.2 m
  3. Lechuguilla Cave · United States489 m
  4. Optymistychna Cave · Ukraine20 m
  5. Veryovkina Cave · Georgia2,212 m
  6. Krubera Cave · Georgia2,199 m
  7. Sarma cave · Georgia1,830 m
  8. Clearwater Cave · Malaysia109 km