Manjanggul Cave is a remarkable lava tube located on Jeju Island, South Korea. It stretches approximately 7.4 kilometers, making it one of the longest lava tubes in the world. The cave was formed by volcanic activity, and its unique geological features include stunning lava stalactites and stalagmites. The cave is part of the UNESCO World Heritage Site known as the "Jeju Volcanic Island and Lava Tubes." Visitors can explore a section of the cave that is about 1 kilometer long, showcasing its natural beauty and fascinating formations. The cave is also home to various species of bats, contributing to its ecological significance.