The second biggest atoll in Polynesia, a 60 km by 25 km rectangle has two main villages: Rotoava in the northeast near the Ngarue pass, one kilometer wide and its airdrome; and then there is Tetamanu, formerly the main village of the island located near the southern Tumakohua pass. This protected atoll together with its six neighboring islands, originally including Taiaro, makes up a Unesco classified nature reserve, which is the proof of the richness of the ecosystem of these atolls: the especially rare flora and fauna, including the hunting king-fisher, the Tuamotu palm, and in the lagoons, crustaceans such as squills or sea cicadas. Among the things to be explored here are: a pearl farm visit and the fairly colorful visit to the sea slug smoke house, the "rori" highly prized by Asian gourmets, and the ancient village of Tetamanu with one of the first Catholic churches built in coral and dating from 1874. The real drawcard to the island is its scuba diving which still holds its share of excitement in the virtually untouched spots where there is to be found a concentration of lagoon and ocean fish such as loach, meru, barracuda, rays and the highly memorable hammerhead and tiger sharks.