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Amami Guntō NP, Kagoshima
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About 1.5 km offshore, Yurigahama appears only around low tide during spring-to-autumn mid and large tides. It may be exposed for just a few hours, and its shape shifts with the weather and waves.
After Fukutoku-Oka-no-Ba submarine volcano erupted in August 2021, pumice drifted about 1,300 km for roughly 2 months. Kagoshima records named Oganeku among the shores where heavy deposits had to be removed.
At the offshore Yurigahama sandbar, researchers found star-shaped and spiral foraminifera shells among the sand grains. A local saying promises good fortune if you pick up as many star-sand grains as your age.
At Yoron’s lunar March 3 Hamaori, families gather seafood at their customary shore; a baby’s feet are dipped in seawater for health, with boys carrying a fish basket and girls a sieve. On April 19, 2026, Oganeku hosted the sea-safety rite as a public event.
Oganeku is a field lab, too: in 2025, local schoolchildren used seepage and conductivity meters to measure groundwater flowing into the sea and the freshwater–saltwater mix—a hands-on look at land–reef connections.
A Geological Survey of Japan sample from Oganeku’s so-called “Crystal Beach” contained coral and shell fragments, foraminifera shells, and sea-urchin spines, plus a little mineral material. Some grains reach 4.5 mm.
Oganeku is also sea-turtle nesting habitat. A Ministry of the Environment document about the beach’s campsite specifically notes turtles lay eggs here; the national park management plan calls for protecting nesting grounds.
The reef lagoon beside Oganeku has suffered long-term coral decline. The Environment Ministry cites mass bleaching and changes in currents and sediment, and notes that coral-restoration efforts are continuing.
Oganeku stretches about 2 km, making it Yoron’s longest white-sand beach. The island tourism association also records its local Yoron-language names: Ufuganiku and Naaganiku.
