Iran
  Iran  , also called  Persia ,  and officially the  Islamic Republic of Iran   , is a country in  Western Asia .  It is bordered to the northwest by  Armenia  and  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 . Its central location in  Eurasia  and proximity to the  Strait of Hormuz  give it significant  geostrategic  importance. Tehran  is the capital and largest city, as well as the leading economic and cultural hub; it is also the most populous city in Western Asia, with more than 8.8 million residents, and up to 15 million including the metropolitan area. With 83 million inhabitants, Iran is the world's  17th most populous country . Spanning 1,648,195...