Manjanggul
Gimnyeong-ri, South Korea
Nature
Manjanggul is a lava tube located in Gimnyeong-ri, Gujwaeup, Jeju City, South Korea. At up to 23 metres wide, 30 metres high and 8.928 km long, it is the 12th-longest lava tube in the world and the second longest on Jeju Island.
From Wikipedia, CC BY-SA 4.0
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