|Rank||Cave Name||Length (km)||Vertical Range (m)||Region||Type||More Info|
|1||Ogof Llyn Parc||4||110||North Wales||Part mine||Short description|
|2||Milwr Tunnel - Powell's Lode Cavern||< 1||110||North Wales||Part mine||Short description|
|3||Ogof Hesp Alyn||2||97||North Wales||All cave||Short description|
If you don't see the cave you want, but you know it should be in the North Wales section, remember that this list only shows caves with at least 60 m depth of natural passage. Other caves may show up in the list of longest caves in North Wales.
However, if you are looking for a specific cave that does have at least 60 m depth of natural passage, and should be listed here, please let me know about it so I can update the database.