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Yonaguni Monument

Yonaguni Monument
Image: Melkov, Wikimedia Commons, CC0. Resized; not otherwise altered. All credits.
LocationOff the south coast of Yonaguni Island, Okinawa Prefecture, Japan
Conventional dateNatural sandstone formation shaped by jointing and erosion (possibly modified).
Alternative date proposals
  • Masaaki Kimura: Human-made terraced monument submerged by post-glacial sea-level rise [1]
What is measured
  • Sea level about 134 m lower at the glacial maximum. [3]

Underwater terraces 5–25 m deep popular with divers. The image shows the 'twin megaliths'.

Claims about this site

ClaimStatusVerdict
The underwater Yonaguni Monument is a human-made structureLeading EdgeOpen question
An advanced civilisation existed during the last Ice Age and was lost in a catastropheLeading EdgeOpen question

Sources

  1. Kimura, M. (2004). Ancient megalithic construction beneath the sea off Ryukyu Islands in Japan, submerged by post-glacial sea-level change. Oceans '04 MTS/IEEE. doi:10.1109/oceans.2004.1405617 proponent
  2. Schoch, R. M. Yonaguni (author's own account of his dives and geological assessment). https://robertschoch.com/yonaguni.html critique
  3. Lambeck, K. et al. (2014). Sea level and global ice volumes from the Last Glacial Maximum to the Holocene. PNAS 111. doi:10.1073/pnas.1411762111 data

Dates are summarised in our own words from the sources listed. Conventional and alternative dates are both reported; "measured" lists only dated or documented findings. Methodology.