Longest caves
| Rank | Cave Name | Length (km) | Vertical Range (m) | Region | Type | More Info |
|---|---|---|---|---|---|---|
| 1 | Poulnagollum - Poulelva | 15 | 140 | Co. Clare | All cave | Short description |
| 2 | Doolin Cave | 10.5 | < 60 | Co. Clare | All cave | Short description |
| 3 | Cullaun Five | 7.2 | < 60 | Co. Clare | All cave | |
| 4 | Coolagh River Cave | 5.285 | 72 | Co. Clare | All cave | |
| 5 | Poulnagree | 5.2 | 130 | Co. Clare | All cave | |
| 6 | Crag Cave | 3.81 | < 60 | Co. Kerry | All cave | Short description |
| 7 | Cullaun Three | 3.5 | 78 | Co. Clare | All cave | Short description |
| 8 | Cullaun Two | 3.335 | < 60 | Co. Clare | All cave | |
| 9 | Poll-Cahercloggaun West-One | 3.17 | < 60 | Co. Clare | All cave | |
| 10 | Cullaun One | 3.1 | < 60 | Co. Clare | All cave | |
| 11 | Fergus River Cave | 3 | < 60 | Co. Clare | All cave | |
| 12 | Mitchelstown New Cave | 2.54 | < 60 | Co. Tipperary | All cave | Short description |
| 13 | Cloyne Cave | 2.5 | < 60 | Co. Cork | All cave | Short description |
| 14 | Gragan West Cave | 2.255 | < 60 | Co. Clare | All cave | |
| 15 | Polldubh | 2.13 | < 60 | Co. Clare | All cave | |
| 16 | Pollballiny | 2.065 | 80 | Co. Clare | All cave | |
| 17 | Poulawillin | 2 | < 60 | Co. Clare | All cave | |
| 18 | Poultalloon | 1.91 | < 60 | Co. Clare | All cave | |
| 19 | Aille River Cave | 1.9 | < 60 | Co. Mayo | All cave | Short description |
| 20 | Poll Cahermacnaghten | 1.8 | < 60 | Co. Clare | All cave | |
| 21 | Doonyvardan Cave | 1.74 | < 60 | Co. Clare | All cave | |
| 22 | Polskeheenarinky | 1.74 | < 60 | Co. Tipperary | All cave | |
| 23 | Faunarooska Cave | 1.69 | 94 | Co. Clare | All cave | |
| 24 | Aillwee Cave | 1.5 | < 60 | Co. Clare | All cave | Short description |
| 25 | Mermaid's Hole (Green Holes of Doolin) | 1.5 | < 60 | Co. Clare | All cave | Short description |
| 26 | The Dark Shamrock Traverse - Pollaloughabo - Pollbehan | 1.5 | < 60 | Co. Galway | All cave | Short description |
| 27 | Ballyglunin Cave | 1.3 | < 60 | Co. Galway | All cave | Short description |
| 28 | Moran's Cave | 1.12 | < 60 | Co. Galway | All cave | |
| 29 | Bullock Pot | 1 | < 60 | Co. Clare | All cave | Short description |
| 30 | Poll-Cahermaan | 1 | < 60 | Co. Clare | All cave |
Total cave length (for caves of 1 km and above): 96.29 km.
If you don't see the cave you want, but you know it should be in the RO Ireland 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 RO Ireland.
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.