Nan Madol

Nan Madol is built on 100 artificial islets formed on the reef, separated by canals.

An excerpt from the article 19 facts about Nan Madol
The detailed city maps contain 16 names of islands and islets. Among them, Nan Douvas draws attention, where the highest wall of the entire complex is rising. Behind it there are four crypts in which the kings of the Saudeleur dynasty and their successors Nahnmwarkis were buried.