Hyeopjaegul and Ssangyonggul Lava Caves are believed to are developed on account of an eruption of Mt Hallasan all around 25 million a long time back, and therefore are thought to have been underneath sea level at enough time due to the presence of fossilised abalone shells and various seashells. https://jaspergs64t.popup-blog.com/26641781/little-known-facts-about-jeju-paradise-lsland