Mataiva, Tepoetiriura or Lazarev atoll is a coral atoll in the Tuamotu Archipelago. It is located in the Palliser group, and is the westernmost of the Tuamotus. The nearest atoll, Tikehau, is located 35 km to the east. Rangiroa is located 79 km to the east, and Tahiti is 311 km to the south.