One of the most famous lava caves in the world, Manjanggul Lava Tube(만장굴-萬丈窟-10km-Long Cave) is a favorite tourist destination and also a UNESCO world heritage site. Manjanggul Cave was formed when the lava spouted from the peak and flowed to the surface. Manjanggul has a variety of interesting structures inside including 70cm long lava stalagmites and the lava tube tunnel itself. Lava stone titled ‘The Stone Turtle’ will catch your eye, as the stone resembles the Island of Jeju it is placed in.The stone pillars and stalactites and unique topographical features of the cave are also notable. Manjanggul maintains temperature between 11~21℃, making it a great site to visit in hot summer seasons. Unfortunately, only 1km of the 13.422km-long Manjanggul Cave is open for tourists to preserve the cave. [Explanation Courtesy of Korea Tourism Organization]
Manjanggul is one of the most famous tourist destinations in the Jeju Island, therefore I did not explain the cave in details. Just google Manjanggul, and all the information comes to you easily. Already well-known to locals and tourists, you may be a bit disappointed if you expect too much. Visit here in hot summer seasons, and the Manjanggul will be a great shelter to stay away from the glowing sun.