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Iriomote Ishigaki NP, Okinawa
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A Yaeyama folk song stages a birthday party for an Amparu crab: the fiddler crab’s waving claw earns it the shamisen, while the powerful giant mud crab becomes the cook. The real mudflat’s crabs supply the cast.
Amparu supports the entire life cycle of 3 crustacean species found only on Ishigaki and Iriomote, including the freshwater shrimp Neocaridina ishigakiensis. It’s more than a stopover: the wetland sustains local endemics from start to finish.
The 10cm mangrove whelk was thought to have disappeared from Ishigaki, then turned up in Amparu surveys in the late 1980s and 1990s. Researchers suspect it was brought from Iriomote as bait to raise local swimming crabs.
Sanizu, observed on the 3rd day of the 3rd lunar month, brought women to the shore to dip their hands and feet in seawater, pray for health and gather shellfish. The date coincides with the year’s greatest tidal range.
After the 1771 tsunami, Amparu’s open shore hosted horse contests called katabaru-uma. The tradition was later revived at Hiré’s Tanadui festival—an event held at Hiré, not at Amparu itself.
Wildlife monitoring from 2009 to 2019 recorded 170 bird species in the Amparu protected area. Its feeding grounds draw birds such as shorebirds, while nearby forest habitat also supports resident species.
One recorded local legend links “Amparu” with setting a net: villagers caught 3 brothers fleeing the historic head tax on the shore. Okinawa’s Prefectural Museum preserves the tale as folklore, not as a proven explanation of the name.
Six mangrove species grow at Amparu, with several near the northern edge of their global range. That makes this Ishigaki estuary a remarkable meeting place for mangrove trees that thrive in warmer parts of the world.
The sea’s influence travels up the Nagura River as far as 2.3km from its mouth. So Amparu’s tidal story doesn’t end at the mudflat: the river corridor itself shifts between freshwater and seawater.
A 2020 environmental profile compiled records of 1,690 species across Amparu and the rivers flowing into it, including 538 insects, 218 birds and 267 large bottom-dwelling animals. The count covers the wider catchment, not just the mudflat.
