Manjanggul Cave is a 7.4-km lava tube. It is an internationally-known large cave at 18m-wide and 23m-high. There are lots of lava tubes in the world, but one which is hundreds of thousands of years old, and as well preserved as Manjanggul, is rare. Manjanggul has three entrances created by sinkholes. Only the second entrance and 1km of the cave is open to the public now. Inside the cave, there are various lava tube structures including lava stalactites, and lava-stalagmites. The 7.6m lava column at the end of the public section of the cave is the largest of its kind in the world.