Eastern Jeju island, Jeju Province

Manjanggul lava tube

Walking through the Manjanggul lava tube, the world's longest system of lava-tubes formed by flowing lava which once moved beneath its hardened surface; when the volcanic eruption had ceased and the lava flow drained away, it left this long, cave-like channel.

Photo by Ludo Kuipers, Sat Jun 28, 2014
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