|Area||2.829 km2 (1.092 sq mi)|
|Overseas collectivity||French Polynesia|
Motu One's reef encloses totally a lagoon without a pass. All of its sides are covered with low, wooded sandy islands except for its southern side. Motu One means Sand Island in Tahitian, that is a low-lying, sandy islet that cannot sustain permanent human habitation.
The name Atoll Bellinghausen or more rarely Bellingshausen was given to this small atoll by the a Russian officer and navigator of Baltic German descent in the Imperial Russian Navy Otto von Kotzebue in honour of Fabian Gottlieb von Bellingshausen. It should not be confused with Bellingshausen Island, part of the South Sandwich Islands, in the southwest Atlantic.