An administrative division, administrative unit, administrative entity or country subdivision (or, sometimes, geopolitical division or subnational entity) is a portion of a country or other region delineated for the purpose of administration.
A bakhsh (بخش) is a type of administrative division of Iran.
The counties of Iran, also called shahrestan (شهرستان), are administrative divisions of larger provinces (ostan).
The Iranian calendars (گاهشماری ایرانی Gâhshomâriye Irâni) are a succession of calendars invented or used for over two millennia in Iran (Persia).
Iran is subdivided into thirty one provinces (استان Ostān, plural استانها Ostānhā), each governed from a local center, usually the largest local city, which is called the capital (Persian: Markaz) of that province.
Shahrestan or Shahristan (Persian: شهرستان) may refer to.