A huge step-like rock formation on the seabed southeast of Yonaguni Island. Debate continues over whether it is a man-made ruin or a natural formation.
Sighting & Incident Site
Yonaguni Monument
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Positions on the map are a rough guide to the area where a legend or sighting is set. Most pins are placed at representative points of a municipality or prefecture (outside Japan, a city position rounded to about 10 km, or the country), not at the exact place.
Municipality points: Geolonia address data (CC BY 4.0), based on the Address Base Registry (Digital Agency of Japan) / Country points: Natural Earth
| Encyclopedia | Yonaguni Monument |
|---|---|
| Location | Okinawa Yonaguni |
| Type of place | Sea |
| Map position | Approximate position (Municipality), not the exact place |
A giant underwater rock formation resembling steps and terraces off Yonaguni Island, Okinawa. Discovered by a diver in 1986, it is a popular dive site where debate continues over whether it is a man-made ruin or a natural formation.