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Ogasawara NP, Tokyo
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A cave on Minamijima preserves seabird bones from 6,000–600 years ago. More than 70% came from 3 rare petrels no longer known to breed here—today’s colonies aren’t a simple return to the island’s past.
Airborne laser mapping in 2026 revealed submerged sinkholes continuing northwest from Minamijima to 50 m deep. The drowned karst spans at least 9.5 km²—roughly 200 Tokyo Domes—much of it hidden until now.
A 2023 study dated Minamijima’s Mandarina luhuana shells as late as 1456–1635, revising the snail’s likely extinction to the 17th century—centuries later than the traditional 1,000–2,000-year estimate.
Ogi-ike, the famous blue cove, sits in a limestone sinkhole joined to the open sea by a natural rock arch. Its white beach formed within this flooded landform—not a volcanic crater lagoon.
Feral goats stripped Minamijima until their eradication in 1971; later visitors trampled regrowth, so guide-led route rules began in 2003. Stepping stones on bare patches now help protect recovering plants.
In 2023, Japan’s first land-snail reintroduction trial began here: captive-bred Chichijima katatsumaimai and Anakata katatsumaimai, absent from Minamijima for roughly 200–300 years, were released back.
On Minamijima, tiny Bulwer’s petrels tuck nests into wave-sheltered vertical holes in sharp limestone and gaps between loose rocks. The island’s jagged karst doubles as seabird housing.
