The Yonaguni Monument is a gigantic underwater rock formation, located in Japan, off the coast of Yonaguni.
Also known as the ‘Yonaguni Submarine Ruins’, the monument was discovered in 1987 by a director of the Yonaguni-Cho Tourism Association, Kihachiro Aratake. And by accident, we might add.
While looking for a place to observe the sharks, the scuba diver noticed several architectonic structures.
And shortly after, a group of scientist directed by Masaaki Kimura of the University of the Ryukyus began investigations.
This relic consists of sandstones and mudstones of the Lower Miocene Yaeyama Group: a stone column measuring 7 meters in height, a straight 10-meter long wall, a low star-shaped platform, an L-shaped rock, a 5-meter-wide ledge and an isolated boulder resting on a low platform.