Oloirien is an administrative ward in the Ngorongoro District of the Arusha Region of Tanzania.

The ward covers an area of 261.9 km2 (101.1 sq mi),[1] and has an average elevation of 2,000 m (6,600 ft).

[2] According to the 2012 census, the ward has a total population of 9,485.

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