Ryūsendō is a renowned limestone cave located in Iwaizumi, Iwate Prefecture, Japan. Known for its stunning natural beauty, it features a series of underground lakes with incredibly clear, blue water. The cave extends over 3,100 meters, with parts that remain unexplored. Tourists can traverse well-lit pathways to witness the breathtaking stalactites and stalagmites, as well as the crystal-clear lakes, some of which are among the deepest underground lakes in Japan. The cave is also home to unique fauna, including rare species of bats.
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