Iran (i/ɪˈrɑːn/ or /aɪˈræn/; Persian: ایران [ʔiˈɾɒn] ( listen)), officially the Islamic Republic of Iran (Persian: جمهوری اسلامی ایران, Jomhuri-ye Eslāmi-ye Irān), is a country in Western Asia. The name "Iran", which in Persian means "Land of the Aryans", has been in native use since the Sassanian era, in antiquity. It came into use internationally in 1935, before which the country was known to the Western world as Persia (pron.: /ˈpɜrʒə/ or /ˈpɜrʃə/). Both "Persia" and "Iran" are used interchangeably in cultural contexts; however, "Iran" is the name used officially in political contexts.
Tehran ( pronunciation (help·info)) (Persian: تهران Tehrān; pronounced [tehˈɾɒːn]), sometimes spelled Teheran, is the capital of Iran and Tehran Province. With a population of about 8,300,000 and a 15 million-plus metropolitan area, it is Iran's largest city and urban area, and one of the largest cities in Western Asia.
In the 20th and 21st centuries, Tehran has been the subject to mass migration of people from all around Iran. The city is home to many historic mosques, churches, synagogues and Zoroastrianfire temples. Contemporary Tehran is a modern city featuring many structures, of which the Azadi (Freedom) Tower and the Milad Tower have come to be symbols of Tehran itself. Tehran is ranked 29th in the world by the population of its metropolitan area. Throughout Iran's history, the capital has been moved many times, and Tehran is the 32nd national capital of Iran although it has been Iran's capital for about 220 years. Persian is the city's native tongue, spoken by roughly 98% of the population. The majority of people in Tehran identify themselves as Persians. In pre-Islamic and early Islamic times, Tehran was called Ray (which in the Avesta occurs in the form of Ragha).