Three Counties System
The Three Counties System is a set of inter-connected limestone solutional cave systems spanning the borders of Cumbria, Lancashire and North Yorkshire in the north of England. The possibility of connecting a number of discrete cave systems in the area to create a single super-system that spans the county borders was first proposed by Dave Brook in 1968, and it was achieved in 2011. The system is currently over 86 kilometres (53 mi) long, making it the longest in the UK and the thirtieth longest in the world, and there continues to be scope for considerably extending the system.
| Three Counties System | |
|---|---|
Duke Street in Ireby Fell Cavern II | |
| Location | North-West England |
| Coordinates | 54°12′25″N 2°30′23″W |
| Depth | 253 metres (830 ft) |
| Length | about 86 kilometres (53 mi) |
| Geology | Carboniferous limestone |
| Entrances | 53 |
| Difficulty | Various |
| Hazards | Various |
| Access | Various |
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