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Yambaru NP, Okinawa
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A Yambaru plant long mistaken for a familiar meadow-rue turned out to be a new species. Named Yambaru meadow-rue in 2025, it is known from just 1 site, with fewer than 50 mature plants.
A strange bird call was recorded in Yambaru in 1964, but its owner remained unidentified until a 1981 capture revealed the Okinawa rail—a new species, and Japan’s first newly described bird in 60 years.
The Yambaru long-armed scarab is Japan’s largest beetle, reaching 5–6 cm. Its larvae develop in nutrient-rich hollows inside old trees, making the forest’s veteran giants part of the beetle’s nursery.
Shikuwasa, now a signature crop of Ogimi, once grew wild in the village’s hills. Its name combines words for “sour” and “let eat”; when the fruit ripens golden, locals call it kugani—“gold.”
Yambaru’s 3-village region covers less than 0.1% of Japan, yet has about half the bird species recorded nationally and roughly a quarter of Japan’s native frogs. That’s a remarkable concentration in one small corner of Okinawa.
Japan’s only flightless bird, the Okinawa rail, spends much of its time on the forest floor—but climbs into trees to sleep at night. It’s an unexpected bedtime habit for a ground-running bird.
In Yambaru’s headwater streams, some frog tadpoles take about 2 years to complete their aquatic stage. That means tadpoles can be present year-round, providing food for other animals in the forest ecosystem.
Anderson’s crocodile newt lays its eggs on damp ground, not in water. Rain triggers hatching and can wash the larvae into a stream; adults can also spread their ribs sideways to deter predators.
After the first Yambaru whiskered bats were found on Okinawa Island in 1996, researchers caught 3 more in 2018 in the former Northern Training Area. The tiny males weighed just 4.9–5.5 g.
In Kijōka, making bashōfu cloth involves 23 steps, but weaving accounts for only about 1%; growing the thread banana takes roughly 3 years. The craft nearly vanished after World War II before local weavers revived it.
Yambaru’s forests supplied charcoal and building timber to Naha and Shuri, carried by boat before roads were well developed. The hard work of hauling logs lives on in Kunjan Sabakui, a traditional work song.
Around Shioya Bay, 7 communities share the Ungami sea festival, a tradition of about 500 years. Its ceremonies pray for harvests and well-being, and include a ceremonial boat race; the festival is a nationally designated folk cultural property.
The Yambaru component of the World Heritage site covers 7,721 hectares. It is one of 5 protected components on 4 islands, which together form a 42,698-hectare serial World Heritage property.
