Longest caves
| Rank | Cave Name | Length (km) | Vertical Range (m) | Region | Type | More Info |
|---|---|---|---|---|---|---|
| 1 | Ogof Draenen | 70 | 151 | South Wales | All cave | Short description |
| 2 | Ogof Ffynnon Ddu | 50 | 308 | South Wales | All cave | Short description |
| 3 | Agen Allwedd | 37.5 | 160 | South Wales | All cave | Short description |
| 4 | Ogof Daren Cilau System | 30 | 232 | South Wales | All cave | Short description |
| 5 | Dan-Yr-Ogof | 16 | 150 | South Wales | All cave | Short description |
| 6 | Ogof Craig A Ffynnon | 13 | 115 | South Wales | All cave | Short description |
| 7 | Carno | 8.9 | 63 | South Wales | All cave | Short description |
| 8 | Little Neath River Cave | 8.8 | 125 | South Wales | All cave | Short description |
| 9 | Ogof Llyn Parc | 4 | 110 | North Wales | All cave | |
| 10 | Otter Hole | 3.352 | < 60 | South Wales | All cave | Short description |
| 11 | Porth yr Ogof | 2.53 | < 60 | South Wales | All cave | Short description |
| 12 | Tunnel Cave | 2.135 | 145 | South Wales | All cave | Short description |
| 13 | Ogof Hesp Alyn | 2 | 97 | North Wales | All cave | Short description |
| 14 | Ogof Llyn Ddu | 1.77 | < 60 | North Wales | All cave | |
| 15 | Ogof Afon Hepste | 1.76 | < 60 | South Wales | All cave | Short description |
| 16 | Llanelly Quarry Pot | 1.705 | 80 | South Wales | All cave | Short description |
| 17 | Llygad Llwchwr | 1.6 | < 60 | South Wales | All cave | Short description |
| 18 | Tooth Cave | 1.525 | < 60 | South Wales | All cave | Short description |
| 19 | Ogof Cynnes | 1.5 | < 60 | South Wales | All cave | Short description |
| 20 | Ogof Tarddiad Rhymney | 1.5 | < 60 | South Wales | All cave | Short description |
| 21 | Eglwys Faen | 1.34 | < 60 | South Wales | All cave | Short description |
| 22 | Pant Mawr Pot | 1.2 | 97 | South Wales | All cave | Short description |
| 23 | Ogof Rhyd Sych | 1.11 | < 60 | South Wales | All cave | Short description |
| 24 | Ogof Pwll Swnd | 1.075 | 76 | South Wales | All cave | |
| 25 | Ogof Fechan | 1.067 | < 60 | South Wales | All cave | Short description |
| 26 | Ogof Ap Robert | 1.015 | 90 | South Wales | All cave | Short description |
| 27 | Ogof-Yr-Ardd | 1 | < 60 | South Wales | All cave | Short description |
Total cave length (for caves of 1 km and above): 267.384 km.
If you don't see the cave you want, but you know it should be in the Wales section, remember that this list only shows caves with at least 1 km length of natural passage. Other caves may show up in the list of deepest caves in Wales.
However, if you are looking for a specific cave that does have at least 1 km length of natural passage, and should be listed here, please let me know about it so I can update the database.