Hyeopjaegul and Ssangyonggul Lava Caves are considered to are already created due to an eruption of Mt Hallasan about 25 million years ago, and they are thought to are actually beneath sea level at time mainly because of the presence of fossilised abalone shells and also other seashells. But recall, https://johnathancq53t.blogrelation.com/32859642/everything-about-jeju-paradise-lsland