Tags: Cave.
Ryūsendō (龍泉洞) is one of Japan’s three largest limestone caverns located in Iwaizumi Iwate Prefecture Japan.Ryūsendō has an accessible length of 1200 meters making it the 62nd longest in Japan; however its depth of 249 metres (817 ft) from the entrance to its lowest point is the 5th deepest in Japan. The total confirmed length of the cave is currently 3631 metres (11913 ft) although the cave may extend much further.
