Yongcheon Cave, Limestone lava tube cave in Jeju, South Korea.
The cave system extends for 3360 meters through multiple passages, featuring a main corridor of 2590 meters and several branching pathways totaling 370 meters.
Maintenance workers discovered the cave entrance in 2005 when investigating an electricity pole that had unexpectedly sunk into a deep ground opening.
Archaeological findings within the cave, including earthenware vessels and animal remains, indicate human activities dating back to the Unified Silla Kingdom period.
Access to the cave requires descending a 10-meter steel ladder, where temperatures remain constant at 17 degrees Celsius throughout the year.
The cave contains an 800-meter-long underground lake inhabited by three unidentified fish species adapted to the subterranean environment.
Location: Jeju
GPS coordinates: 33.54853,126.77844
Latest update: March 2, 2025 23:09
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