Hyeopjaegul and Ssangyonggul Lava Caves are considered to happen to be designed on account of an eruption of Mt Hallasan about 25 million a long time in the past, and therefore are considered to happen to be below sea level at some time due to existence of fossilised abalone shells https://beau96air.ja-blog.com/26950043/the-smart-trick-of-jeju-paradise-lsland-that-nobody-is-discussing