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Amami Guntō NP, Kagoshima
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Yoron is ringed by the Amami Islands’ largest coral-reef lagoon. Near Ōganeku and Yurigahama, the broad lagoon extends about 1.5 km offshore, creating a huge shallow-water world inside the reef.
At spring low tide, Yoron’s reef crest can rise above sea level and restrict exchange between the lagoon and open sea. In this changing shallow world, the sandy cay Yurigahama appears at low tide.
Yoron’s only aquaculture is mozuku farming in the eastern reef lagoon; the seaweed also flavors the island’s local mozuku soba. The lagoon is both a working farm and part of a much-loved food tradition.
Yoron has a mini-vocabulary for young rabbitfish: iyūgama; their scoop-boat is iyūgama-buni, their catcher iyūgama-shikincu, and the salted delicacy iyūgama-garashi. A fish run comes with its own language.
Yoron’s reef crest began rising from 3 m below sea level about 5,260–3,230 years ago. Spurs and grooves then grew seaward; the reef’s modern landform zones took shape over roughly 5,000 years.
On the old lunar 3rd day of month 3, Yoron’s San-gachi brings families to the beach to celebrate children’s growth and remember the dead. The reef shore is still a community gathering place, not just scenery.
In fiscal 1973, Yoron crews removed 309,000 crown-of-thorns starfish; another 216,818 were removed in 1974. The annual tally stayed above 10,000 until 1984—a long battle for the island’s corals.
A 2023 survey found 80% live-coral cover along 300 m off Chabana, including table corals over 1 m across. At Akasaki, coral cover had climbed from 50% in 2017 to 80% as Acropora grew.
Yoron’s word unparu means “sea and field,” capturing how islanders understand land and ocean as connected. A national-park plan also notes that reefs and coasts have many fine-grained local place names.
On Yoron, reef stress can begin inland: one conservation model estimated roughly 80% of nitrogen reaching the sea travels through groundwater. Farm practices on this porous limestone island can affect the lagoon far below ground.
Yunnu Pishibana brought Yoron’s NPO, local historians, school staff, fishers and farmers together to record reef-based fishing knowledge and related village rituals—a community archive of life shaped by the reef.
