The deepest cave in Wales and the United Kingdom is the ‘Ogof Ffynnon Ddu’ cave: 274.5 metres.
Longest Caves
- Ogof Draenen | Length (km): 70 | Vertical Range (m): 151
- Ogof Ffynnon Ddu | Length (km): 60.644 | Vertical Range (m): 291
- Agen Allwedd | Length (km):32.8 | Vertical Range (m): 160
- Ogof Daren Cilau System | Length (km): 28 | Vertical Range (m): 232
- Dan-Yr-Ogof | Length (km): 16 | Vertical Range (m): 150
All Caves Located in England | All Caves Located In Scotland
Cathole Cave
Location: Parc le Breos Cwm valley, near Swansea
Dan yr Ogof
Location: Brecon Beacons National Park, Abercraf, Swansea SA9 1GJ
Ogof Agen Allwedd
Location: Llangattock escarpment
Ogof Craig a Ffynnon
Location: Brecon Beacons National Park, Main Rd, Abergavenny NP7 0RR
Ogof Draenen
Location: North of Blaenavon, Wales
Ogof Ffynnon Ddu
Location: Upper Swansea Valley
Ogof Hen Ffynhonnau
Location: Alyn Gorge, Flintshire, Wales
Ogof Hesp Alyn
Location: Alyn Gorge, Flintshire, Wales
Ogof Llyn Parc
Location: Esclusham Mountain, Wrexham, Wales
Ogof Nadolig
Location: Alyn Gorge, Flintshire, Wales
Ogof y Daren Cilau
Location: Llangattock escarpment
Otter Hole
Location: St Arvans, Monmouthshire, Wales
Porth yr Ogof
Location: near Ystradfellte
Goldsland
Location: Vale of Glamorgan, south Wales
Kendrick’s Cave
Location: on the Great Orme
Paviland Cave
Location: Gower peninsula of south Wales
Cefn Caves
Location: Elwy valley, north of Denbigh, in Denbighshire, North Wales.
Llygad Llwchwr
Location: Black Mountain range, Brecon Beacons National Park
Long Hole Cave
Location: between Paviland and Port Eynon
Coygan Cave
Location: near Laugharne, Carmarthenshire, Wales
