Kabul is the capital and largest city of Afghanistan, located in the eastern section of the country. It is also a municipality, forming part of the greater Kabul Province, and divided into 22 districts. According to estimates in 2021, the population of Kabul is 4.6 million and it serves as Afghanistan's political, cultural and economical center. Rapid urbanization has made Kabul the world's 75th largest city.
Kabul is located high up in a narrow valley between the Hindu Kush mountains and bounded by the Kabul River, with an elevation of 1,790 metres making it one of the highest capitals in the world. The city is said to be over 3,500 years old, mentioned since at least the time of the Achaemenid Empire. Located at crossroads in Asia – roughly halfway between Istanbul in the west and Hanoi in the east – it is in a strategic location along the trade routes of South and Central Asia, and a key location of the ancient Silk Road.