Gimnyeonggul

The Gimnyeonggul Lava Tube, located in Donggimnyeong-ri, Gujwa-eup, Jeju City, is one of the World Heritage Sites in South Korea. The lava tube is about 705 m long, and is believed to be separated from Manjanggul Lava Tube by lava flows. The upper part of entrance is 12 m high and 4 m wide and is bent in a collapsed S shape. The upstream end of the passage was sealed with subsequent lava flows. The downstream passage is bi-level and the entrance is filled with sediments, most of which are carbonate sediments that had flown in from the beach. This is understood to be why there are lime features.

Gimnyeonggul

The Gimnyeonggul Lava Tube, located in Donggimnyeong-ri, Gujwa-eup, Jeju City, is one of the World Heritage Sites in South Korea. The lava tube is about 705 m long, and is believed to be separated from Manjanggul Lava Tube by lava flows. The upper part of entrance is 12 m high and 4 m wide and is bent in a collapsed S shape. The upstream end of the passage was sealed with subsequent lava flows. The downstream passage is bi-level and the entrance is filled with sediments, most of which are carbonate sediments that had flown in from the beach. This is understood to be why there are lime features.