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Nan Madol is located near the southern side of the Federated States of Micronesia. It is the only ancient city ever built
atop a coral reef.
https://www.smithsonianmag.com/history/nan-madol-the-city-built-on-coral-reefs-147288758/ Nan Madol, Pohnpei Island, Micronesia, Pacific
An Ancient Man-Made Island Built On Coral Reefs With Unexplained Technology in Micronesia in the Pacific
The Mystery of Nan Madol: An Ancient Man-Made Island Built With Unexplained Technology
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dr. π (pi)
.