Tatami-ishi (Tatami Rocks)
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Unusual hexagonal and pentagonal rocks, formed by cooling lava, resemble traditional Japanese tatami mats and are a signature feature of Kume Island.

Geological feature in Kumejima, Okinawa, Japan. Nationally Designated Natural Monument since 2014. Located on the south coast of Oujima (Ou Island), connected to Kumejima by a bridge. Comprises about one thousand pentagonal and hexagonal rocks, 1 to 1.5 meters in diameter. Formed during the Miocene period by columnar jointing of andesitic lava. Water erosion has leveled and smoothed the rock tops.

Why Go

🌊 See unique hexagonal and pentagonal rock formations
πŸŒ‹ Witness natural phenomenon of cooled andesite magma
πŸ“Έ Great photo opportunities, especially at low tide
🚢 Easy access to Ou Island via bridge

Tips

πŸ’‘ Best viewed at low tide, check daily tide charts.

Last updated 28 days ago

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