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岩泉町, Japan
Akkadō (安家洞), located in Iwaizumi, Iwate Prefecture, in the Tōhoku region of northern Japan, is the longest limestone cavern in Japan, with a measured length of 23,702 metres (77,762 ft). The cave system was designated as a natural monument by the Japanese government in 1980. Since 1991, a portion o
f the caverns have been open to the public for part of the year.
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