1) Atoll of the Tuamotus 
Niau is a small atoll in French Polynesia, in the commune of Fakarava (Tuamotu archipelago). This atoll has a broad fringing reef, a diameter of 8 km and an area of 20 km². Niau`s lagoon is swampy, hypersaline and entirely enclosed. The narrow strip of land surrounding the lagoon is covered by marsh vegetation. The lagoon area is 33 km² and it ....