Ryugado is one of the three most extensive limestone cave complexes in Japan. It’s thought to have been formed around 150,000,000 years ago. After driving through valleys of rice fields and bamboo groves, you come to the foot of a small mountain. There’s a bus stop, a visitors’ centre, a street of souvenir shops, and an escalator beside a pretty stream flowing down the steep hillside. The entrance to the cave is under an overhanging cliff with a small Shinto shrine.
http://www.shikokutours.com/about-shikoku/points-of-interest/piodetail/250
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