Harlansburg Cave Preserve

Harlansburg Cave is the longest mapped cave in Pennsylvania, at more than four miles of passage. The cave, located in Lawrence County, Pennsylvania, was originally mapped by cavers from Westminster College. When the MAKC leased the cave, MAKC members decided to undertake remapping to more modern standards, with more passage details. 

The cave is also available for recreational trips. Since it is gated, arrangements must be made in advance with the preserve manager.