The Yonaguni Monument: Japan’s Underwater ‘Atlantis’ — or Just Clever Geology?

Underwater rock formations at the Yonaguni Monument off Japan

About 4 min readOff the southern coast of Yonaguni, Japan’s westernmost island, a diver found stepped terraces and right-angled walls 25 metres underwater. One geologist says it is a 10,000-year-old sunken city. Most others say it is natural rock — and the argument has run since 1986.