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Amami Guntō NP, Kagoshima
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At the meeting of the Sumiyo and Yakugachi rivers, the neighboring forest covers about 70 hectares—roughly 0.7 km²—and is Japan’s second-largest mangrove stand, after Iriomote. The park borders this tidal forest.
Locals call the Ryukyu ayu yaji. It is a distinct ayu subspecies, isolated from mainland ayu on a million-year timescale; Amami holds the only natural wild population today. The park’s “River Tunnel” is one place to spot them.
The park’s restaurant gives Amami’s keihan a handy twist: its “keihan ball” serves rice with chicken and toppings, finished with hot chicken broth. This island hospitality dish is traditionally said to have welcomed Satsuma officials.
A river flows right over the park’s “River Tunnel.” From inside, visitors can watch Ryukyu ayu swimming in the water above—a wonderfully unexpected way to meet Amami’s rare fish.
Ryukyu ayu split their early lives between river and sea: newly hatched fish drift to coastal waters, then grow before heading upriver. Around Sumiyo, mangrove roots also give young fish shelter from birds and larger fish.
These trees stand near the cool edge of a tropical world: Japan’s Environment Ministry identifies the Sumiyo river mouths as habitat for mangrove species near the northern limit of their global range, including Mehirugi and Ohirugi.
Some do: Mehirugi seeds sprout while still attached to the mother tree, forming long, seedling-like propagules before they fall. The park’s guide gives their average length as about 20 cm.
Despite its mangrove-sounding name, Yaeyama-hirugi-shijimi is a clam. Amami City’s biodiversity plan identifies the Sumiyo mangrove mudflats as the northern edge of its range and a habitat for this prefecturally endangered species.
The neighboring Sumiyo mudflats are Kagoshima Prefecture’s largest recorded habitat for southern soldier crabs. These little crabs walk straight ahead—not sideways—and spiral into the sand when danger approaches.
For the male Okinawa white fiddler crab, the enormous claw isn’t the dining tool: the park’s guide says it eats with its small pincer. Females have 2 small pincers and use both to feed.
The park’s guide describes mangrove crabs with shells 15–20 cm wide—and says a mature male’s oversized claw can account for half its body weight. It is a formidable-looking neighbor in the estuary mud.
The barred mudskipper clings to mangrove roots with its head above the water. When it ventures onto the mud, it can breathe through moist skin and the lining of its mouth and throat, so staying damp matters.
The park’s mangrove-view lookout stands on one of Amami’s old yamashiro, or hill-castle, sites. The same hilltop that now frames a sweeping forest panorama once formed part of the island’s defensive landscape.
The grove beside the park became an Amami City natural monument on September 1, 1992. Today it is also within the national park’s special protection area, recognizing the forest as more than a beautiful backdrop.
