Yonaguni Monument
Yonaguni · Okinawa · Japan
The Yonaguni Monument is a mysterious underwater structure off Japan's westernmost island — terraced steps, right angles, and flat surfaces at 5-25 meters that some believe are ruins of an ancient civilization. Whether natural or man-made, the site is visually stunning. Hammerhead sharks visit in winter (December-March), adding excitement to the enigma.
Marine Life
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Location
Yonaguni · Okinawa · Japan
Coordinates: 24.4350, 123.0100
Dive Site Depth Profile
Visual depth progression and waypoint route for Yonaguni Monument
Why dive here
Videos
What Is The Yonaguni Monument? Japan's Underwater Pyramid
Yonaguni Monument - Japan's Lost Atlantis
Conditions & safety
FAQ
Is the monument man-made?
Debated — some geologists say it's natural sandstone erosion, others argue the precise terraces and right angles indicate human construction 10,000+ years ago.
When can I see hammerheads?
December to March — Yonaguni is one of the best places in Japan for hammerhead shark encounters.
How do I get there?
Fly to Yonaguni from Naha (Okinawa) or Ishigaki. Japan's westernmost island, just 110 km from Taiwan.
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