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🇯🇵 Yonaguni Monument

Yonaguni Monument · 일본 오키나와 요나구니섬

Location

Overview

A mysterious stepped underwater terrain off Japan's westernmost Yonaguni Island, where debate over whether it's man-made ruins or natural erosion has drawn worldwide attention. Also famous for winter hammerhead shark schooling.

Highlights

A mysterious stepped underwater terrain that sparked man-made-ruins debate
Encounters with large hammerhead shark schools in winter (Dec–Mar)
A unique geographic position as Japan's westernmost border island
Yonaguni's own distinct culture and scenery, apart from Okinawa's main island

Good to know

SafetyOpen water with strong currents — intermediate-or-above experience is recommended.
SeasonHammerheads Dec–Mar; the ruins are diveable year-round, though summer visibility is better.
·Reached via a domestic flight from Naha, Okinawa, via Ishigaki, to Yonaguni.

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