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Iran,[a] also called Persia, and officially the Islamic Republic of Iran,[b] is a country in Western Asia. With 82 million inhabitants, Iran is the world's 18th most populous country. Its territory spans 1,648,195 km² (636,372 sq mi), making it 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,[c] 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. Its central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz, give it geostrategic importance. Tehran is the capital, largest city, and leading economic and cultural center.