Usual hours and prices, checked 2026-10-07 against the sources under “What this place is”. They can change for holidays and events — confirm before you go. Official site
Our guide
Akkadō, in the town of Iwaizumi, Iwate, is the longest limestone cave in Japan, with a measured length of 23,702 m. The cave system was designated a Natural Monument in 1980, and since 1991 part of it has been open to the public for part of the year.
We have not checked the open season, hours, fees or a public-transport route, so check before you go.
Written by japan-spots.com (2026-09-22) from the sources credited on this page. Distances are straight lines between map positions.
Photos
Photos from Wikimedia Commons, each under its own licence — see credits
What this place is
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 of the caverns have been open to the public for part of the year.
Visitor information checked: 2026-10-07 · Official visitor information · Official visitor information
Background text from Wikipedia (CC BY-SA 4.0)
What to expect at this type of place: Landmark
Getting there
We do not have step-by-step transit directions for this spot yet. Open the location on Google Maps for routes from where you are staying.
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