Nan Madol on Pohnpei island: ~100 artificial islets, walls nearly 60ft high & 17ft thick, ~750,000 tons of basalt. Stones up to 50 tons each. Built around 1180-1200 AD by a population thought to number around 1,000 people. Bamboo raft experiments showed even smaller stones would sink. Underwater structures reportedly extend beneath the ocean. 🌊🗿
Nan Madol: 750,000-ton Pacific coral reef complex defies conventional construction explanation

Site mentioned
Key facts
- Located on Pohnpei island in Pacific Ocean, built on coral reef in shallow waters
- Consists of 92 artificial islets connected by network of canals lined with stone
- Massive walls rise nearly 60 feet high, up to 17 feet thick
- Stones weigh 5 to 50 tons each
- Estimated 750,000 tons of stone used in construction
- Conventional dating places construction around 1180 AD by Sordel dynasty
- Basalt columns transported from distant quarries across rugged terrain and water
- Bamboo raft experiments showed even smaller stones would sink
- Population of Pohnpei at time estimated only 20,000-30,000 people
- Local legend attributes construction to brothers Olyipa and Olopa with ability to fly stones
- Anthropologist John Kubari explored site in 19th century, collected artifacts, ship wrecked on return
- German governor Victor Berg reportedly found enormous skeletal remains of 10-foot-tall giants in sealed tomb in 1907, died next day
- Japanese investigators claimed to find platinum coffins with giant skeletons on ocean floor
- Explorers report underwater pillars, tunnels, caves, and stone structures extending beneath ocean
- Some theories link site to legendary lost continent of Moo
- Basalt magnetic properties and location in typhoon zone led some to propose ancient energy or weather control installation theory
Sources
Nan Madol: “In the space between things” (article) - Khan Academykhanacademy.org
Nan Madol is a complex of close to 100 artificial rectilinear islets spread over 200 acres that are thought to have housed up to 1000 people.
The Non-Mystery of Nan Madol - Skeptoid Podcastskeptoid.com
There are some 92 of these artificial islets, mostly constructed in a sort of log cabin style made with long basalt columns, with walls and ...
Nan Madol: The City Built on Coral Reefs - Smithsonian Magazinesmithsonianmag.com
Our destination is Nan Madol, near the southern side of the island, the only ancient city ever built atop of a coral reef. Its imposing yet ...
Nan Madol (U.S. National Park Service)nps.gov
Nan Madol is the only extant ancient city built on top of a coral reef. Constructed in a lagoon and surrounded by water on three sides with a stone wall ...
Nan Madol - Wikipediaen.wikipedia.org
Nan Madol is an archaeological site adjacent to the eastern shore of the island of Pohnpei, now part of the Madolenihmw district of Pohnpei state
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