Various theories on the origin of the name Tehran have been put forward.
Iranian linguist Ahmad Kasravi, in an article "Shemiran-Tehran", suggested that Tehran and Kehran mean "the warm place", and "Shemiran" means "the

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Archaeological remains from the ancient city of Ray suggest that settlement in Tehran dates back over 8,000 years.
Classical era
Tehran is in the historical

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Location and subdivisions
The metropolis of Tehran is divided into 22 municipal districts, each with its own administrative center. Of the 22 municipal districts, 20 are located in Tehran County's Central District, while districts 1 and 20are respectively located in the

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The city of Tehran has a population of approximately 10 million in 2016. With its cosmopolitan atmosphere, Tehran is home to diverse ethnic and linguistic groups from all over the

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Tehran is the economic centre of Iran. About 30% of Iran's public-sector workforce and 45% of its large industrial firms are located in the

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Transport
Tehran has one of the highest betweenness and closenesscentrality among the cities of Iran,

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Tehran is the largest and the most important educational center in Iran. There are a total of nearly 50 major colleges and universities in Greater Tehran.
Since the establishment of Dar ol Fonun by the order of Amir Kabirin the mid-19th century, Tehran has

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