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The Islamic Republic of Iran has been divided into regions in a number of different ways historically. It has been divided into five administrative regions since 2014.
Current administrative regions
Iran's thirty-one provinces were grouped into five regions on 22 June 2014, based on a decision by the Ministry of Interior. In this change, the adjacency, geographical location and similarities of the provinces were considered.
Histories, travel books and economic analyses often refer to less formal, more historical or geographical, Iranian regions. The borders of these are not fixed and often have changed over time, and even overlapped at the same time.
- Alamut – in the Alborz mountain range of northern Iran;
- Central Iran: Known as Iraq-i Ajam (Persian Iraq)
- Baluchistan (Southeastern Iran) – sometimes just Sistan and Baluchestan province and sometimes all of Baluchistan;
- Caspian Iran (Northern Iran, Tabaristan or "Mardi and Hyrcania") – Gilan province, Mazandaran province, and Golestan province, and historically sometimes northern Semnan
- Eastern Iran
- Iranian Azerbaijan – approximately the current provinces of Region 3, but often excluding Kurdistan province and often excluding the Caspian province of Gilan;
- Iranian Kurdistan – including Kurdistan province, Kermanshah province and parts of Ilam province and parts of West Azerbaijan province;
- Khorasan – consisting of North Khorasan province, Razavi Khorasan province, South Khorasan province, and sometimes eastern Semnan province
- Quhistan – southern Khorasan;
- Southern Iran (also known as the Persian Gulf region of Iran) – Fars, Kohgiluyeh and Buyer Ahmad, Hormozgan and Bushehr provinces;
- Southeastern Iran (Carmania)