Niau is a small atoll in French Polynesia, in the commune of Fakarava. This atoll has a broad fringing reef, a diameter of 8 km and an area of 53 km. Niau's lagoon is swampy, hypersaline and entirely enclosed. The narrow strip of land surrounding the lagoon is covered by marsh vegetation. The enclosed lagoon area is 33 km², making the land siz…Niau is a small atoll in French Polynesia, in the commune of Fakarava. This atoll has a broad fringing reef, a diameter of 8 km and an area of 53 km. Niau's lagoon is swampy, hypersaline and entirely enclosed. The narrow strip of land surrounding the lagoon is covered by marsh vegetation. The enclosed lagoon area is 33 km², making the land size at 20 km². The lagoon has an unusual green color.
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