The underground lake that spreads along the Shimizu River promenade in Ryusendo Cave, Iwaizumi-cho, Iwate Prefecture, is truly mysterious. The blue gradient that continues from the third underground lake with a depth of 98m is called "Dragon Blue," and its beauty is reminiscent of jewels. This view, which can be enjoyed while feeling the nature of the four seasons, continues to fascinate visitors. Inside Ryusendo Cave, one of Japan's three largest limestone caves, abundant spring water and various shapes of stalactites await visitors.
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