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Yambaru NP, Okinawa
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With a shell barely 4 mm long, Okinawa’s threatened mushioi snail is easy to miss. In a full-day survey near Nekumachiji’s summit in 2015, researchers found just 1 live male; it needs damp, airy leaf litter.
Nekumachiji’s walking-trail network includes sections of Ogimi’s 31-km stone boar wall, built to protect crops. Villagers repaired it from 1776 to 1782, sometimes collecting and stacking stones by moonlight.
A Ryukyu-endemic camellia, Camellia lutchuensis, fruits on Nekumachiji. On a guided walk, a local guide demonstrated an old-fashioned trick: crack a fallen fruit with a stone, and its seed leaves a sheen of oil on your hand.
Nekumachiji’s limestone karst and red-soil patches bring together plants adapted to both ground types. Though only 361 m high, its summit also supports cloud forest and rare plants adapted to wind-scoured conditions.
Nekumachiji is nicknamed “Butterfly Mountain.” An Ogimi ecological survey recorded 58 butterfly species, and the mountain area is habitat for the Konoha butterfly, whose folded wings resemble a dead leaf.
At 360.7 m, Nekumachiji is Ogimi’s highest peak, yet the summit view spans all 3 Yanbaru villages and reaches islands including Iheya, Kouri and Ie—a remarkably broad horizon for a low mountain.
Some of the mountain’s large Castanopsis and Lithocarpus grew from shoots that sprouted after trees were cut. Ogimi’s history editors noted these regrown trees during a 2021 Nekumachiji field walk.
