Iran also known as Persia (/ˈpɜːrʒə/), officially the Islamic Republic of Iran (Persian: جمهوری اسلامی ایران Jomhuri-ye Eslāmi-ye Irān ) , Iran is Located in Western Asia . It has over 81 million inhabitants, Iran is 18th-most-populous country in the world . Comprising a land area of 1,648,195 km2 (636,372 sq mi), it is the second-largest country in the Middle East and the 17th-largest in the world. Iran is bordered to the northwest by Armenia and the Republic of Azerbaijan, to the north by the Caspian Sea; to the northeast by Turkmenistan; to the east by Afghanistan and Pakistan; to the south by the Persian Gulf and the Gulf of Oman; and to the west by Turkey and Iraq.
Tehran is the country's capital and largest city, as well as its leading economic and cultural center.
Iran is home to one of the oldest civilizations of the world .