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|تهران بزرگ · Greater Tehran|
|• Mayor||Mohammad Bagher Ghalibaf|
|• City Council||Chairman Mehdi Chamran|
|• Urban||730 km2 (280 sq mi)|
|• Metro||1,274 km2 (492 sq mi)|
|Elevation||900 to 1,830 m (2,952 to 6,003 ft)|
|• Density||12,896/km2 (33,400/sq mi)|
|• Population Rank in Iran||1st|
|Population Data from 2015 Census and Statistical Centre of Iran Metro area figure refers to Tehran Province.|
|Time zone||IRST (UTC+03:30)|
|• Summer (DST)||IRDT (UTC+04:30)|
Tehran (Persian: تهران – Tehrān, pronounced [tehˈrɒːn]) is the capital of Iran and Tehran Province. With a population of around 9 million in the city and 16 million in the wider metropolitan area, Tehran is the most populous city of Iran, the 2nd-most populous city in Western Asia and the 3rd-largest metropolitan area in the Middle East. It is ranked 29th in the world by the population of its metropolitan area.
In the Classical era, part of the present-day city of Tehran was occupied by a Median city that in the Avesta occurs as Rhaga. It was destroyed by the Mongols in the early 13th century, and remains now as a city in Tehran Province, located towards the southern end of the modern-day city of Tehran.
Tehran was first chosen as the capital of Iran by Agha Mohammad Khan of the Qajar dynasty in 1796, in order to remain within close reach of Iran's territories in the Caucasus, before being separated from Iran as a result of the Russo-Persian Wars, and to avoid the vying factions of the previously ruling Iranian dynasties. The capital has been moved several times throughout the history, and Tehran is the 32nd national capital of Iran.
The city was the seat of the Qajars and Pahlavis, the two last imperial dynasties of Iran. It is home to many historical collections, such as the royal complexes of Golestan, Sa'dabad, and Niavaran, as well as the country's most important governmental buildings of the modern period.
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