Karaj in the context of "Iranian Azerbaijanis"

Isfahan or Esfahan (Persian: اصفهان [esfæˈhɒːn] ) is a city in the Central District of Isfahan County, Isfahan province, Iran. It is the capital of the province, the county, and the district. It is located 440 kilometres (270 miles) south of Tehran. The city has a population of approximately 2,237,990, making it the fourth-most populous city in Iran, after Tehran, Mashhad and Karaj, and the second-largest metropolitan area.

Isfahan is located at the intersection of the two principal routes that traverse Iran, north–south and east–west. Isfahan flourished between the 9th and 18th centuries. Under the Safavid Empire, Isfahan became the capital of Iran, for the second time in its history, under Abbas the Great. It is known for its Persian–Muslim architecture, grand boulevards, covered bridges, palaces, tiled mosques, and minarets. Isfahan also has many historical buildings, monuments, paintings, and artifacts. The fame of Isfahan led to the Persian proverb Esfahān nesf-e-jahān ast ('Isfahan is half the world'). Naqsh-e Jahan Square in Isfahan is one of the largest city squares in the world, and a UNESCO World Heritage Site.

Tehran is the capital and largest city of Iran. It is also the capital of Tehran province and the administrative center for Tehran County and its Central District. With a population of around 9 million in the city, and 15 million in the metropolitan area, Tehran is the most populous city in Iran and West Asia, the second largest metropolitan area in the Middle East after Cairo, and the 24th-most-populous metropolitan area in the world. Greater Tehran includes several municipalities, including but not limited to Karaj, Eslamshahr, Shahriar, Qods, Malard, Golestan, Pakdasht, Qarchak, Nasimshahr, Parand, Pardis, Andisheh and Fardis.

In classical antiquity, part of the territory of present-day Tehran was controlled by Rhages/Rey/Ray). Modern Ray was absorbed into the metropolitan area of Greater Tehran. Tehran was 1st chosen as the capital of Iran in 1786 by Agha Mohammad Khan of the Qajar dynasty, because of its proximity to Iran's territories in the Caucasus—which were contested in the Russo-Iranian Wars—and to avoid the vying factions of prior ruling Iranian dynasties; the capital of Iran had been moved several times throughout its long history, with Tehran becoming the 32nd. Under (1848-1896), Tehran witnessed Iran's first institute of higher learning, bank, railway line, and museum. Large-scale construction works began in the 1920s, and Tehran became a destination for mass migrations from all over Iran especially in the 20th century.

Iran has one of the highest urban population growth rates in the world. From 1950 to 2002, the urban proportion of the population increased from 27% to 60%. The United Nations (UN) predicts that by 2030 80% of the population will live in urban areas. Most internal migrants have settled near the cities of Tehran, Isfahan, Karaj, Ahvaz, Mashhad and Qom. Tehran, with a population of 8.7 million in 2016, is the largest city in Iran and is the nation's capital. Tehran is home to around 11% of Iran's population. It is the hub of Iran's communication and transport networks.

Mashhad, with a population of 4.2 million in 2019, is the second-largest Iranian city and the centre of the province of Razavi Khorasan. Mashhad is one of the holiest Shi'a cities in the world as it is the site of the Imam Reza shrine. It is the centre of tourism in Iran. Between 15 and 20 million pilgrims go to Imam Reza's shrine every year.

Greater Tehran Metropolitan Area is the urban agglomeration around Tehran that covers the central part of the Tehran Province and eastern part of the Alborz Province, that covers the contiguous cities of Tehran, Ray, 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 and Fardis combined. Therefore, it can be estimated that the population of the urban agglomeration was approximately 15 million people in 2016, and it is sinking at a rate of 25 cm per year due to the accelerated influx and overuse of natural resources.

Andisheh (Persian: انديشه) is a city in the Central District of Shahriar County, Tehran province, Iran. It is a new, planned city, located 30 kilometres (19 mi) from Tehran, northwest of Shahriar, and southeast of Karaj.

Abū Bakr Muḥammad ibn al Ḥasan al-Karajī (Persian: ابو بکر محمد بن الحسن الکرجی; c. 953 – c. 1029) was a 10th-century Persian mathematician and engineer who flourished at Baghdad. He was born in Karaj, a city near Tehran. His three principal surviving works are mathematical: Al-Badi' fi'l-hisab (Wonderful on calculation), Al-Fakhri fi'l-jabr wa'l-muqabala (Glorious on algebra), and Al-Kafi fi'l-hisab (Sufficient on calculation).

The Central District of Karaj County (Persian: بخش مرکزی شهرستان کرج) is in Alborz province, Iran. Its capital is the city of Karaj.

Karaj County (Persian: شهرستان کرج) is in Alborz province, Iran. Its capital is the city of Karaj.