Mystical systems
Yonaguni Monument
Direct answer
Yonaguni Monument: The Yonaguni Monument is a large underwater rock formation with flat terraces and sharp steps off Yonaguni, the westernmost island of Japan, whose origin, natural or carved, is disputed.
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At a glance
- Also called
- yonaguni underwater ruins, yonaguni pyramid, japan underwater pyramid, yonaguni submarine ruins
- Found in
- Mystical Systems
- Related
- Bimini Road, The Land of Mu, Atlantis, Pseudoarchaeology
The Yonaguni Monument is a large underwater rock formation with flat terraces and sharp steps off Yonaguni, the westernmost island of Japan, whose origin, natural or carved, is disputed.
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Is the Yonaguni Monument man-made?
The formation lies off the south coast of Yonaguni in the Ryukyu Islands, its top a few metres below the surface and its base about 25 metres down. It is a mass of sandstone and mudstone cut into broad platforms, straight edges and right-angled steps, which is why divers named it a monument and sometimes a pyramid.
Two readings exist. Masaaki Kimura, a marine geologist at the University of the Ryukyus, has argued for years that it was shaped by people, perhaps when the sea stood lower at the end of the last ice age. Most geologists who have examined it hold that the rock splits naturally along parallel bedding planes and vertical joints, which produces steps and terraces without any tool. Similar forms can be seen above water on the same island's shore.
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What sets Yonaguni Monument apart
Yonaguni is the rare underwater claim where the two sides agree on the stone and differ only on the cause. The rock is a fine sandstone of the Yaeyama Group, bedded in flat layers and crossed by straight joints, in a region of frequent earthquakes. Rock of that kind breaks into steps of its own accord. The case for carving therefore depends on features jointing cannot make, such as drilled holes or quarry marks, and it is these that remain contested and unexcavated.
- Location: off the south coast of Yonaguni, Okinawa Prefecture
- Found: 1986, by the diver Kihachiro Aratake
- Depth: from a few metres to about 25 metres below the surface
- Rock: sandstone and mudstone of the Yaeyama Group
- Argues for carving: Masaaki Kimura, University of the Ryukyus
- Official status: not recognised as a cultural property by Japan
Often mistaken for something else: The Bimini Road is a row of loose slabs on sand; Yonaguni is solid bedrock with terraces, so the question there is whether anyone trimmed what nature had split.
The story behind Yonaguni Monument
A local diver, Kihachiro Aratake, came upon the site in 1986 while looking for places to watch hammerhead sharks. Kimura began surveying it in the 1990s. The geologist Robert Schoch of Boston University dived there in 1997 and judged it mainly natural. Japan's Agency for Cultural Affairs has not recognised the formation as a cultural property, and no excavation has produced tools or other artefacts tied to its shaping.
Why Yonaguni Monument matters
Yonaguni Monument is a live example of how regular shapes in rock invite the idea of a builder, and of what would be needed to show one.
How to read Yonaguni Monument
Divers visit it as a famous site; lecturers set out with it what counts as evidence of human work in stone.
Yonaguni Monument in practice: an example
A diver sees a staircase; a geologist beside them points to the same stepped breaks in the cliff above the waterline.
Where readings of Yonaguni Monument go wrong
Claims of carved faces, roads and writing at the site rest on photographs and have not been confirmed by excavation.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Mystical Systems
- Aliases
- yonaguni, yonaguni underwater ruins, yonaguni pyramid, japan underwater pyramid, yonaguni submarine ruins
- Last updated
- 2026-09-26
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Common questions
Is the Yonaguni Monument man-made?
That is not established. One Japanese researcher argues it was carved, and most geologists think it is a natural formation of jointed sandstone. No tools, inscriptions or dated remains have settled the matter in favour of carving.
How old is the Yonaguni Monument?
The rock itself is around twenty million years old. If people had worked it on dry land, that would have been before the sea rose over it, at least several thousand years ago. No such date has been demonstrated.
Can you dive at the Yonaguni Monument?
Yes. Dive operators on Yonaguni take visitors to the site. Currents there can be strong, and local operators treat it as a dive for those with experience.
