Manjanggul Lava Tube

Manjanggul, which runs 7.4 km out to sea, is one of the longest and best-preserved lava tubes in the world. Formed about 300,000 years ago by lava moving beneath the hardened flow of Geomunoreum volcano, Manjanggul also contains an incredibly large, rare lava column as well as a diverse community of cave biota.Read more