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Alternative titles: Islamic Republic of Iran; Jomhr-ye Eslm-ye rn

Iran, a mountainous, arid, ethnically diverse country of southwestern Asia. Much of Iran consists of a central desert plateau, which is ringed on all sides by lofty mountain ranges that afford access to the interior through high passes. Most of the population lives on the edges of this forbidding, waterless waste. The capital is Tehrn, a sprawling, jumbled metropolis at the southern foot of the Elburz Mountains. Famed for its handsome architecture and verdant gardens, the city fell somewhat into disrepair in the decades following the Iranian Revolution of 197879, though efforts were later mounted to preserve historic buildings and expand the citys network of parks. As with Tehrn, cities such as Efahn and Shrz combine modern buildings with important landmarks from the past and serve as major centres of education, culture, and commerce.

IranEncyclopdia Britannica, Inc.The heart of the storied Persian empire of antiquity, Iran has long played an important role in the region as an imperial power and laterbecause of its strategic position and abundant natural resources, especially petroleumas a factor in colonial and superpower rivalries. The countrys roots as a distinctive culture and society date to the Achaemenian period, which began in 550 bce. From that time the region that is now Irantraditionally known as Persiahas been influenced by waves of indigenous and foreign conquerors and immigrants, including the Hellenistic Seleucids and native Parthians and Ssnids. Persias conquest by the Muslim Arabs in the 7th century ce was to leave the most-lasting influence, however, as Iranian culture was all but completely subsumed under that of its conquerors.

An Iranian cultural renaissance in the late 8th century led to a reawakening of Persian literary culture, though the Persian language was now highly Arabized and in Arabic script, and native Persian Islamic dynasties began to appear with the rise of the hirids in the early 9th century. The region fell under the sway of successive waves of Persian, Turkish, and Mongol conquerors until the rise of the afavids, who introduced Ithn Ashar Shism as the official creed, in the early 16th century. Over the following centuries, with the state-fostered rise of a Persian-based Shite clergy, a synthesis was formed between Persian culture and Shite Islam that marked each indelibly with the tincture of the other.

With the fall of the afavids in 1736, rule passed into the hands of several short-lived dynasties leading to the rise of the Qjr line in 1796. Qjr rule was marked by the growing influence of the European powers in Irans internal affairs, with its attendant economic and political difficulties, and by the growing power of the Shite clergy in social and political issues.

The countrys difficulties led to the ascent in 1925 of the Pahlavi line, whose ill-planned efforts to modernize Iran led to widespread dissatisfaction and the dynastys subsequent overthrow in the revolution of 1979. This revolution brought a regime to power that uniquely combined elements of a parliamentary democracy with an Islamic theocracy run by the countrys clergy. The worlds sole Shite state, Iran found itself almost immediately embroiled in a long-term war with neighbouring Iraq that left it economically and socially drained, and the Islamic republics alleged support for international terrorism left the country ostracized from the global community. Reformist elements rose within the government during the last decade of the 20th century, opposed both to the ongoing rule of the clergy and to Irans continued political and economic isolation from the international community.

Iran is bounded to the north by Azerbaijan, Armenia, Turkmenistan, and the Caspian Sea, to the east by Pakistan and Afghanistan, to the south by the Persian Gulf and the Gulf of Oman, and to the west by Turkey and Iraq. Iran also controls about a dozen islands in the Persian Gulf. About one-third of its 4,770-mile (7,680-km) boundary is seacoast.

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Iran | history - geography | Britannica.com