Akkadō, Show cave in Iwaizumi, Japan.
The limestone cave system extends for 23,702 meters through multiple chambers, featuring natural formations of stalactites, stalagmites, and an underground lake.
Initial exploration began in 1959 by the Japan Cave Groundwater Research Group, leading to its designation as a Natural Monument in 1980.
The cave network represents an essential part of Sanriku Geopark, contributing to geological education and research in northern Japan.
Tours operate from mid-April to November, with entrance fees of 1,000 yen for adults and 600 yen for children aged 6-15.
At a constant temperature of 8 degrees Celsius, the cave contains a massive underground lake stretching two kilometers north to south.
Location: Iwaizumi
Part of: Sanriku Geopark
Website: https://town.iwaizumi.lg.jp/docs/2016022400177
GPS coordinates: 39.98360,141.73600
Latest update: May 11, 2025 19:41
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