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Yonaguni Monument
DebatedSite

Yonaguni Monument

Terraces, right angles, "staircases" 25 meters deep. The geological consensus sees naturally fractured sandstone — an academic minority argues for a sunken city.

Location
Japan · Asia & Pacific
Civilisation
Natural? Jōmon?
Period
above water until ~−10,000
Technique
Terraces and angles under 25 m of water
Studies

real support, not settled. A revisable snapshot of the state of research, never a judgement.

→ Show on the map
In pictures

The elements of the site

8 photos · Wikimedia Commons
© Melkov · CC0
© Melkov · CC0
© Melkov · CC0
© Vincent Lou from Shanghai, China · CC BY 2.0
Location

Where the site is

24.430° N, 123.010° E · satellite view

🔬 Science

What science says

  • The local sandstone naturally fractures along orthogonal planes — similar formations exist on dry land.

  • No artifact, tool or trace of occupation has been recovered from the site.

  • The geological consensus (Schoch 1999, Nunn 2009, Ogata et al. 2020, AGJ conf. 2024) concludes it is an entirely natural formation: differential erosion of sandstone and mudstone along bedding planes and orthogonal tectonic joints, with no human intervention detected. Neither the Agency for Cultural Affairs nor Okinawa prefecture recognizes the site as heritage.

  • In 2019, Ogata et al. (University of the Ryukyus) conducted a topographic analysis using a digital elevation model and field investigation: the underwater formations are identical to the natural outcrops visible on the island's south coast, confirming a geological origin with no human intervention.

  • In 2020, Ogata T., Otsubo M. and Itoh H. (University of the Ryukyus / AIST) conducted a topographic analysis using a 10 m digital elevation model and field investigation at three geosites on the island: the underwater formations are identical to the natural outcrops visible on the south coast, confirming a geological origin with no human intervention (DOI: 10.4157/ejgeo.15.44).

🜂 Mystery

What remains unexplained

themes & techniques

Related to

Sunken citiesJapanSea levelDebated formations
every line can be checked

Studies & sources

ConsensusSchoch R.M., « Yonaguni Enigmatic Underwater Monuments » (1999) — expertise géologique in situ (3 plongées 1997–2000), Boston Univ. : formation naturelle↗ConsensusSchoch R.M., Voices of the Rocks, Harmony Books (1999) — chap. Yonaguni, position nuancée : >95 % naturel↗ConsensusNunn P.D., Vanished Islands and Hidden Continents of the Pacific, Univ. Hawaii Press (2009), p. 127 — formation naturelle, érosion grès. ISBN 978-0-8248-3219-3↗Peer-reviewOgata T., Otsubo M., Itoh H., « Geosites of Yonaguni Island Located at the Westernmost Point of Japan », E-journal GEO, 15(1), pp. 44–54, 2020 — analyse DEM 10 m + terrain : formation naturelle↗ConsensusWikipedia EN — Yonaguni Monument (révisé 2024–2026) — synthèse géologie, consensus, position gouvernementale↗
Show 7 more sources
AnalyticalNational Geographic, Ryall J., « Japan's Ancient Underwater Pyramid Mystifies Scholars » (2007) — débat Kimura/Schoch↗AlternativeKimura M., « Ancient Megalithic Construction Beneath the Sea off Ryukyu Islands in Japan », Proceedings Oceans '04 MTS/IEEE Techno-Ocean '04, pp. 947–953, 2004 — thèse anthropique (alt)↗AlternativeKimura M., Yamatai Koku wa Okinawa Datta, Daisanbunmei-sha, Tokyo (2010), pp. 200–204 — vision Mu / Lemuria (alt). ISBN 978-4476033052↗AnalyticalFeagans C. (Archaeology Review), « Yonaguni: Monumental Ruins or Natural Geology? » (2017) — analyse critique thèse Kimura↗ConsensusEncyclopædia Britannica — « Yonaguni Monument » (éd. en ligne 2026) — géologie Yaeyama Group, absence reconnaissance officielle↗AnalyticalIFLScience, « Yonaguni Monument: Japan's Atlantis Is A Site Of Geology, History, And Controversy » (2024) — incl. conf. AGJ 2024 Suga/Kyushu Univ. : aucun vestige archéologique↗AnalyticalNew Scientist, vol. 204(2736), p. 41 (2009) — contexte géologique régional Ryukyu. DOI : 10.1016/S0262-4079(09)63140-7↗
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