
On Amami-Oshima, Kagoshima, Amami Resort Basyayama-mura beach had pumice that came from an undersea volcano (Fukutoku-Okanoba) erupting near the Ogasawara islands (way south of Tokyo).
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Pumice rocks are small, lightweight, porous pebbles. Floats on water. Saw it for the first time here.
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In 2021, an army of volunteers took weeks to clean up Okinawan and Amami beaches. It was almost like cleaning up an oil spill. Glad the problem has subsided.
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