|Rank||Cave Name||Length (km)||Vertical Range (m)||Region||Type||More Info|
|1||Aille River Cave||1.9||< 60||Co. Mayo||All cave||Short description|
Total cave length (for caves of 1 km and above): 1.9 km.
If you don't see the cave you want, but you know it should be in the Co. Mayo 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 Co. Mayo.
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.