is one of Japan's three largest limestone caverns. It is located in the town of Iwaizumi, Iwate Prefecture, in the Tōhoku region of northern Japan.
Overview Ryusendo Cave has an accessible length of 4,088 meters, making it the 62nd longest in Japan; however, its depth of from the entrance to its lowest point is the 5th deepest in Japan. The total confirmed length of the cave is currently , although the cave may extend much further. Further exploration has been banned following a fatality in December 1968. The cave system includes at least four underground lakes, the third of which has a depth of , and the fourth of which (not accessible to the public) has a depth of over . The cave system is also home to colonies of greater horseshoe bat, eastern long-fingered bat, brown long-eared bat and Hilgendorf's tube-nosed bat as well as microbats.
Ryusendo Cave was designated a Natural monument by the Japanese government in 1938. The caves were opened to the public in 1934. Its underground lake system was designated one of the "100 Famous Springs of Japan" in 1985 by the Ministry of the Environment.龍泉洞地底湖の水 - 名水百選 (Japanese)
Ryusen Shindo Science Museum The adjacent Ryusen Shindo Science Museum (龍泉新洞科学館, "New Ryusendo Science Museum") cave nearby were discovered in 1967. It claims to be the "first natural cave science museum in the world", and contains displays of earthenware and stoneware discovered in 1967, together with displays on the geology of the main Ryusendo Cave.A Trip to Iwate
Gallery
References
External links
A Trip to Iwate Japan Travel Guide Morioka-Hachimantai Tourist Advisor