Fangatau, or Nakai-erua,[2] is a small atoll in the Tuamotu group in French Polynesia.

The nearest land is Fakahina Atoll, located 72 km to the ESE.

The first recorded European to arrive at Fangatau was Russian explorer Fabian Gottlieb von Bellingshausen on the 10 July 1820 on ships Vostok and Mirni.

Fangatau was the home of Kamake an Iturangi, regarded by anthropologist Kenneth Emory as "the greatest Tuamotuan sage" he ever met.

[5] The atoll is served by the Fangatau Airport (IATA: FGU, ICAO: NTGB).