Keya no Oto

photo by STA3816 · CC BY-SA 3.0

photo by Myuchiwa · CC BY-SA 4.0

The basalt cave, 64 m high and 90 deep, is the largest of its kind in Japan.

The boat enters the Keya no Oto sea cave, carved into the basalt (64 metres high, 90 deep, 10 wide): the largest basalt cave in Japan, one of the country's ‘three great basalt caves’ along with Genbudō and Nanatsugama. It cannot be reached on foot: you can only see it from the sea.

The formation, of volcanic origin, was designated a Natural Monument (天然記念物) in 1966. It lies at the tip of the Itoshima peninsula.

ℹ️ Boats to the cave leave from Keya, from March to December.

🚉 芥屋 · 11 min walk

Sources: ja.wikipedia.org

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