Tehran has nearly 12,000,000 inhabitants and is Iran’s most densely populated region. Its area is around 18,637 square kilometers. The city of Tehran is the center of the province and the capital of the country, it is the central district of the province. Other districts are: Shemiranat, Islam Shahr, the city of Ray, Karaj, Jajrood, Lar, and Rood Shoor. The province gained importance when Tehran was claimed the capital by the