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

Dan yr Ogof

Ogof Agen Allwedd

Ogof Craig a Ffynnon

Ogof Draenen

Ogof Ffynnon Ddu

Ogof Hen Ffynhonnau

Ogof Hesp Alyn

Ogof Llyn Parc

Ogof Nadolig

Ogof y Daren Cilau

Otter Hole

Porth yr Ogof

Goldsland

Kendrick’s Cave

Paviland Cave

Cefn Caves

Llygad Llwchwr

Long Hole Cave

Coygan Cave
Location: near Laugharne, Carmarthenshire, Wales