List of caves in the United Kingdom

This is an incomplete list of caves in the United Kingdom, including information on the largest and deepest caves in the UK. == Longest, deepest and largest == The longest cave system in the UK is the Three Counties System in the Yorkshire Dales, with 86.7 km (53.9 mi) of passageways. It includes the Ease Gill system, the Notts Pot / Ireby Fell Cavern system, the Lost Johns' Cave system, and the Pippikin Pot system, all of which are connected.

Source: Wikipedia — List of caves in the United Kingdom (CC BY-SA 4.0)