Finally, canal walls begin to appear before reaching the main structures that resemble the ceremonial squares constructed by the Mayans and Aztecs. Little known, the Nan Madol ruins on the Reef of Heaven consists of 92 man made islets that cover nearly 150 acres in shallow tidal waters. T he origin of the basalt building stones of Nan Madol is unknown. The hexagonal shape of the stones is natural and not man-made. The space between the stone structures is filled with coral rubble easily obtained nearby.
Walls can reach a height of fifty feet.
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