Greater Tehran is the

urban agglomeration An urban area, built-up area or urban agglomeration is a human settlement with a high population density and infrastructure of built environment. Urban areas are created through urbanization and are categorized by urban morphology as cities, ...

around

Tehran Tehran (; fa, تهران ) is the largest city in Tehran Province and the Capital city, capital of Iran. With a population of around 9 million in the city and around 16 million in the larger metropolitan area of Greater Tehran, Tehran is th ...

that covers the central part of the Tehran Province and eastern part of the

Alborz Province Alborz Province ( fa, استان البرز, ''Ostān-e Alborz'') is one of the 31 provinces of Iran.Ray Ray may refer to: Fish * Ray (fish), any cartilaginous fish of the superorder Batoidea * Ray (fish fin anatomy), a bony or horny spine on a fin Science and mathematics * Ray (geometry), half of a line proceeding from an initial point * Ray (gra ...

, Shemirānāt, and other areas. As of 2012, Greater Tehran had a population of close to 14 million residents. The 2016 census had the population at 13.3 million in Tehran Province (only 200 thousands of them outside Tehran and the suburban counties) and 2.2 million in

Karaj Karaj ( fa, کرج, ) is the capital of Alborz Province, Iran, and effectively a satellite city of Tehran. Although the county hosts a population around 1.97 million, as recorded in the 2016 census, most of the county is rugged mountain. The ur ...

and

Fardis Fardis ( Persian: فردیس) is a city in Alborz Province, Iran. Gallery 2nd square of Fardis.jpg, Second square of main blvd. of Fardis See also * Karaj Karaj ( fa, کرج, ) is the capital of Alborz Province, Iran, and effectively a sa ...

combined. So it can be estimated that the population of the urban agglomeration was about 15 million people in 2016, and it is sinking 25 cm per year because of the accelerated influx and the overuse of natural resources. Since the 1960s, much of Greater Tehran's growth has been caused by an influx of urban poor into informal settlements on the fringe.Zebardast, E. (2006). Marginalization of the urban poor and the expansion of the spontaneous settlements on the Tehran metropolitan fringe. Cities, 23(6), 439-454. Greater Tehran should not be confused with the following: * Tehran Province (area 18,814 km², population 13.27 m – 2016). Part of the province is too far from Tehran and has too low a population density to be classified as the part of agglomeration *

Tehran County Tehran County ( fa, شهرستان تهران) is located in Tehran province, Iran. The capital of the county is Tehran. At the 2006 census, the county's population (including those portions of the county later split off to form Pardis County ...

(area 1,300 km², population 8.85 million (2016) with 97.5% of the population living in Tehran City itself) * Tehran City includes 22 districts, two of them fully and one partially are located outside of Tehran County. The city's area is about 730 km². The extension of the city to other counties began in 1973 to include the villages surrounding the city of

Tajrish Tajrish ( fa, تجريش, , also romanized as Tajrīš) is a neighbourhood of Tehran, capital of Iran. Administratively it is in Shemiranat County, Tehran Province. It used to be a village and later was absorbed into the city of Tehran. The Tajri ...

(Evin, Darakeh, Niyavaran, Rostan Abad, Gholhak, Zargandeh, Elahiyeh, Davoudiyeh, and Zarrabkhaneh) and the cities of

Vanak Vanak () is a neighbourhood in the northern part of Tehran, capital of Iran and there is a square and a street named after it. The word Vanak means "Small (ash) Tree" in Persian. The name derives from the original older village of Vanak (''Deh-e ...

and

Rey Rey may refer to: *Rey (given name), a given name *Rey (surname), a surname * Rey (''Star Wars''), a character in the ''Star Wars'' films *Rey, Iran, a city in Iran * Ray County, in Tehran Province of Iran * ''Rey'' (film), a 2015 Indian film *The ...

to which “Kooye Siman” had been annexed during the years 1956 to 1966.

Geographys

There is no exact definition of Tehran agglomeration borders and composition. Beside

, also

Shemiranat County Shemiranat County ( fa, شهرستان شمیرانات) is located in Tehran province, Iran. The capital of the county is Shemiran, which is part of the city of Tehran. At the 2006 census, the county's population was 37,778, in 11,178 househol ...

, Ray County, Eslamshahr County,

Pakdasht County Pakdasht County ( fa, شهرستان پاکدشت) is in Tehran province, Iran. The capital of the county is the city of Pakdasht. At the 2006 census, the county's population was 240,841 in 61,234 households. The following census in 2011 co ...

, Robat-Karim County,

Varamin County Varamin County ( fa, شهرستان ورامین) is in Tehran province, Iran. The capital of the county is the city of Varamin. At the 2006 census, the county's population was 540,442 in 134,538 households. The following census in 2011 cou ...

Shahriar County Shahriar County ( fa, شهرستان شهریار) is located in Tehran province, Iran. The capital of the county is Shahriar. At the 2006 census, the county's population (including those portions of the county later split off to form Malar ...

Qods County Qods County ( fa, شهرستان قدس) is in Tehran province, Iran. The capital of the county is the city of Qods. At the 2006 census, the region's population (as Qods District of Shahriar County Shahriar County ( fa, شهرستان ...

Malard County Malard County ( fa, شهرستان ملارد) is in Tehran province, Iran. The capital of the county is the city of Malard. At the 2006 census, the region's population (as Malard District of Shahriar County Shahriar County ( fa, شه� ...

Pishva County Pishva County ( fa, شهرستان پیشوا) is in Tehran province, Iran. The capital of the county is the city of Pishva. At the 2006 census, the region's population (as Pishva District of Varamin County Varamin County ( fa, شهرس� ...

, and

Baharestan County Baharestan County ( fa, شهرستان بهارستان) is in Tehran province, Iran. The capital of the county is the city of Golestan. At the 2006 census, the county's population (as Bostan and Golestan Districts of Robat Karim County ...

in Tehran Province and also

Karaj County Karaj County ( fa, شهرستان کرج) is located in Alborz province, Iran. The capital of the county is Karaj. At the 2006 census, at which time it was a county in Tehran Tehran (; fa, تهران ) is the largest city in Tehran Prov ...

and probably even

Nazarabad County Nazarabad County ( fa, شهرستان نظرآباد) is located in Alborz province, Iran. The capital of the county is Nazarabad. At the 2006 census, at which time it was a county in Tehran Tehran (; fa, تهران ) is the largest ci ...

and

Savojbolagh County Savojbolagh County ( fa, شهرستان ساوجبلاغ) is located in Alborz province, Iran. The capital of the county is Hashtgerd. At the 2006 census, at which time it was a county in Tehran province, its population (including those port ...

Alborz Province Alborz Province ( fa, استان البرز, ''Ostān-e Alborz'') is one of the 31 provinces of Iran.Tehran Tehran (; fa, تهران ) is the largest city in Tehran Province and the Capital city, capital of Iran. With a population of around 9 million in the city and around 16 million in the larger metropolitan area of Greater Tehran, Tehran is th ...

Geography of Tehran Tehran {{tehran-geo-stub