Blueyebabe @ Jeju - Manjanggul Lava Tube

Manjanggul Cave (만장굴) is a listed as one of the UNESCO World Heritage Site in 2007. It is one of the finest lava tunnels in the world, and is a designated natural monument. A lava tunnel is formed when the lava that was deep in the ground spouts from the peak and flows to the surface. Manjanggul Cave has a variety of interesting structures inside including 70cm lava stalagmites and the lava tube tunnels. Only 1km of the 13,422m Manjanggul Cave is open to the tourists. The inside of the tunnel sustains at a temperature of 11~21℃, creating a comfortable atmosphere.

Yeha tour group photo

Manjanggul Lava Tube entrance

Lava Flowlines

When lava flows in a tube, the level of the flow is often recorded on the walls. These features are called lava flowlines. Numerous flowlines are found in Manjanggul Lava Tube, indicating that the level of lava flows was falling continuously inside the active tube.

this shows the classic tube shape
and the curbs on the wall mark former flow levels
*spot blueyebabe inside this picture

Turtle Rock (Lava Raft)

it is shaped like Jeju Island

Due to its resemblance to Jeju Island, the lava raft named Turtle Rock has become a symbol Manjanggul Lava Tube. A lava raft is a remnant of rock rubble that was carried downflow by a lava flow, eventually to become 'frozen' on the floor when the lava flow solidified. On the other hand, "Turtle Rock" formed by accretion of hot lava along the margin of fallen rock after it was settled on the floor. Flowlines along the margin of the "Turtle Rock" coincide with those left on thw wall.

Lava Column

A lava column forms when lava pours down from the ceiling of the floor and congeals. Lava columns are found in many lava tubes in the world. However, the 7.6m-high lava column in Manjanggul Lava Tube is the largest known lava column in the world. The lava poured down from the ceiling spread across the floor of the lower passage and made well-developed lava toes.