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日本三大鍾乳洞のひとつで国の天然記念物。総延長4,088m以上のうち約700mが公開され、水深98mの第三地底湖など3つの地底湖が見学可能。世界有数の透明度を誇る「ドラゴンブルー」の湖水が神秘的。
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岩手県下閉伊郡岩泉町岩泉字神成1-1
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