Katiu, or Taungataki, is an atoll of the central Tuamotus in French Polynesia. It is located west of Makemo Atoll's westernmost point. It measures in length with a maximum width of . Its total area, including the lagoon is and a land area of approximately . There are many narrow islands on the north-eastern side of its long reef with a total land area of about . Its lagoon is connected to the ocean.
Katiu has a population of 250 inhabitants. The main occupations are fishing, copra harvesting and pearl farming. The most important village is called Toini; it is located on one of the long islands of the northeastern reef.
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