Kaitei Iseki), is a submerged rock formation off the coast of ••••••••, the southernmost of the Ryukyu Islands, in Japan.
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Marine geologist Masaaki Kimura claims that the formations are man-made stepped monoliths.
Schoch also believes that the "drawings" identified by Kimura are natural scratches on the rocks.
A 5 m (16 ft) wide ledge that encircles the base of the formation on three sides