Ryūsendō (龍泉洞) 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.
Wikimedia, Wikidata Rock Spring Cave; Ryusendo; Ryūsendō solutional cave, show cave, Selected 100 Exquisite and Well-Conserved Waters of Japan, Top 100 Geological Sites in Japan, Japan, link={{{3}}}