{ir-an'} Iran is the largest and most populous country in Southwest Asia. The nation possesses abundant petroleum resources and is also important because of its rapidly developing economy and strategic location. Iran shares a long land border with the \TUSSR\t on the north; with a coastline 3,180 km (1,976 mi) long, it commands navigation on the \TPersian Gulf\t, the Strait of \THormuz\t, and the Gulf of Oman in the south (see \TOman, Gulf of\t); Iran also shares borders with Turkey and Iraq on the west and with Afghanistan and Pakistan on the east. The country was known to the West as Persia, from the ancient Greek name Persis, but in 1935 the Iranian government requested use of the older and correct name, Iran, meaning "Land of the Aryans." Iran was an independent monarchy for more than 2,500 years until 1979. In that year the shah of Iran, \TMuhammad Reza Shah Pahlavi\t, was deposed and an Islamic republic was declared. LAND AND RESOURCES The topography of Iran consists mainly of a central plateau rimmed by high mountains; most of the country lies above 450 m (1,500 ft), and about 15% is above 2,000 m (6,500 ft). The only extensive lowlands, all restricted in width to between 15 and 115 km (10 and 70 mi), occur along the southern shores of the \TCaspian Sea\t and along the shores of the Gulf of Oman. About half of the country is dominated by the arid central plateau, with elevations ranging from 600 to 900 m (about 2,000 to 3,000 ft). The mountain ranges encircling the plateau are the \TElburz Mountains\t and their structural continuation in the Talish Mountains and the Koppeh Dagh on the north, the \TZagros Mountains\t on the southwest, and the Makran Range on the south. The highest mountains are in the Elburz, where Mount \TDemavend\t, an extinct volcanic peak located northeast of Tehran, rises to 5,671 m (18,606 ft), the highest point in Iran. One of the most extraordinary features of Iranian topography is an uninhabitable arid salt waste, the Dasht-e-Kavir, centered 485 km (300 mi) southeast of Tehran. Soils The soils used most extensively for farming in Iran are the rich brown forest soils found along the coastal regions of the Persian Gulf and the Caspian Sea. Elsewhere, soils suitable for farming are largely alluvial and limited to river valleys in mountainous areas and along the \TShatt-al-Arab\t (the mouth of the Tigris-Euphrates). However, water availability rather than soil quality is the determining factor for agriculture, and large areas could be farmed if water were available. Climate Iran has a varied continental type of climate marked by extremes in both temperature and precipitation. Summers are extremely hot along the Persian Gulf, where temperatures of 50 deg C (120 deg F) are not uncommon. In inland areas, daytime highs also occasionally exceed 50 deg C (120 deg F) but fall rapidly at night. Winters are generally cold, except along the milder Caspian and Persian Gulf shores, with temperatures reaching below 0 deg C (32 deg F) on the plateau. In Tehran the average January temperature is 2 deg C (36 deg F), and the average for July is 30 deg C (86 deg F). Precipitation ranges from more than 1,270 mm (50 in) in the northwestern Zagros and the Elburz mountains to less than 50 mm (2 in) in southeastern areas of the central plateau. Drainage The most important river in Iran is the Karun, which rises in the central Zagros and joins the Shatt-al-Arab at Khorramshahr. The Karun, which flows across a broad alluvial plain, is navigable to Ahvaz and is Iran's only navigable river. Three other rivers that maintain their flow all year are the Atrak in the northeast, which rises in the Koppeh Dagh and flows into the eastern side of the Caspian Sea; the Safid, which flows through the Elburz to the south shore of the Caspian Sea; and the Araks in the northwest, which flows into the \TUSSR\t before entering the western side of the Caspian Sea. Other rivers in Iran tend to dry up in summer and flow only intermittently. Qanats, or long underground water tunnels, are widely used to bring water from the mountains into the plateau. Vegetation and Animal Life About 10% of Iran is covered with forest, most of it deciduous and located in the mountains bordering the Caspian Sea. A variety of trees and shrubs also covers parts of the Zagros Mountains. Drier parts of the country are generally devoid of vegetation. Common trees in the oases are poplars, tamarisks, date palms, myrtles, and mulberries. On the plateau the fauna include wild boars, foxes, jackals, and a few lions and tigers in the wilder areas; numerous smaller animals; and, in the drier areas, a variety of lizards and other creatures adapted to arid conditions. Resources Iran is tremendously rich in minerals, especially petroleum and natural gas. In 1986 it was the sixth-largest producer of oil in the world (after the \TUSSR\t, the United States, Saudi Arabia, China, and Mexico), with an average output of 700 million barrels per year. Petroleum production declined substantially beginning in 1979. It is estimated that the petroleum reserves will last for 40 years. Most oil fields are located in the southwest, especially in Khuzestan province; some are under the waters of the Persian Gulf; and extensive discoveries have been made in other parts of the country. Natural gas supplies are also enormous, about 14 trillion cu m (600 trillion cu ft), and constitute the world's second-largest reserves (after the \TUSSR\t). Much of the natural gas is exported by pipeline to the \TUSSR\t. In the 1970s iron and coal deposits were developed for use in the new steel industry, and large deposits of chromite, copper, lead, zinc, and salt are only beginning to be exploited on a large scale. PEOPLE The population of Iran is ethnically complex, and minority groups staunchly defend their provincial separatism and seek autonomy in local affairs. About two-thirds of the total population is descended from Aryan tribes who migrated to Iran from central Asia in the 17th century BC. The remaining one-third is composed mostly of Turks and Arabs, as well as small minorities of Armenians and Jews. The largest Aryan group are Persians, or Farsi, who constitute 63% of the total population and live mainly in the central plateau. Also of Aryan origin are the Gilani and Mazandarani, who live on the northern edge of the plateau and around the shores of the Caspian Sea. Many of Iran's important ethnic minorities (although also of Aryan descent) are nomadic and have strongly resisted culture change, with some even demanding separate nations; these groups include the \TKurds\t, who live mainly in the northern Zagros Mountains; the \TBakhtiari\t and Lurs, who live in the southern half of the Zagros Mountains; and the BALUCHI, who live in southeast Iran along the borders with Afghanistan and Pakistan. The largest Turkic-speaking group are the Azerbaijani, who live along the Soviet border in northwestern Iran. Arabs predominate in oil-rich Khuzestan province and along the Persian Gulf; and Armenians and Jews are concentrated in urban areas. The official language is Persian, or Farsi, an \TIndo-European\t language written in the Arabic script. The dialect of the Persians is considered standard and is quite unlike that spoken by the Gilani and Mazandarani. Related to Persian but different enough to be considered separate languages are Kurdish, Luri, and Baluchi. Azerbaijani is the most widely used of the Turkic languages, which belong to the \TUral-Altaic language\t group. Arabic, a Semitic language, is widely spoken in Khuzestan province. About 98% of all Iranians are Muslims; 93% are \TShiites\t, or members of the Shia sect of Islam. Iran is the world's center of Shiite Islam, and it is the official state religion. Most of the ethnic minorities, however, including Kurds, Baluchi, Turks, and Arabs, are \TSunnites\t, or members of the Sunni sect of Islam. Leadership of the Shiites rests with a priestly class of mullahs, whose leaders have great political influence and include about 400 ayatollahs, or "holy ones." Since the 1979 revolution, even the most secular Iranians have been forced to adhere to strict Islamic codes of behavior. The principal minority religions are \TBaha'i\t, \TZoroastrianism\t, and Christianity (notably the \TNestorian church\t). Baha'is have been severely persecuted by the government since the revolution. Demography Large areas of Iran are uninhabited. The population is concentrated along the southern shores of the Caspian Sea, the Atrek River valley in the northeast, the Karun River valley and Tigris-Euphrates delta in the southwest, and the mountain valleys of the northwest. The largest urban center is \TTehran\t, the capital, which has grown rapidly in recent decades. Other large urban centers are \TIsfahan\t, \TShiraz\t, and \TTabriz\t. \TMashhad\t and \TQum\t are important Shiite religious centers. Education and Health Education is free and compulsory for all children from age 6 to age 11. Since the revolution, many new schools have been built, textbooks have been rewritten to place greater emphasis on religion and traditional values, and classes have been segregated by sex. The country's universities, closed after revolution, have gradually reopened since 1983; the largest is the University of Tehran (1934). Today higher education focuses primarily on agricultural and vocational studies. Health care has improved since the 1960s but remains inadequate, particularly in rural areas, although, since the revolution, a greater emphasis has been place on providing social services to those areas. The Arts Iran has a rich and indigenous culture. Poetry is traditionally the most important art form and the 12th-century \TOmar Khayyam\t is perhaps the most famous poet (see \TPersian literature\t). Music and architecture are also historically important; traditional forms of both have been influenced by Western styles in recent decades (see \TPersian art and architecture\t). Iran is famous for its crafts, including ceramics and silver and gold metalwork, but the traditional industry of carpet making seems to be in an irreversible decline. ECONOMIC ACTIVITY During the 1960s and 1970s the shah attempted to transform Iran into a modern, industrial nation. As revenues increased following the world rise in oil prices in the 1970s, Iran enjoyed one of the highest economic growth rates in the world. This rapid growth created a prosperous middle class, but it also caused widespread social and cultural dislocation. After the 1979 revolution, Iran's revolutionary government emphasized self-sufficiency, and Islamic scholars had greater power over economic decisions than did government officials until late 1987. Most industries (including the oil industry, in 1981) were nationalized, and many large-scale projects were abandoned. Oil exports have remained at a relatively high level despite the damage to wells, refineries, and export terminals caused by the long \TIran-Iraq war\t (1980-88), which consumed about 30% of the \TGNP\t and adversely affected the economy. Manufacturing Manufacturing now provides a larger share of the \TGNP\t than agriculture, although it employs fewer people. The principal industries are oil related and include refining and the production of petrochemicals. The principal oil-processing center is \TAbadan\t. Steel manufacturing began in 1973, and domestic steel is widely used in the production of automobiles, buses, trucks, tractors, refrigerators, and electrical machinery. The textile industry, Iran's oldest major industry, is centered mainly in Isfahan. Agriculture and Fishing About 12% of the land is suitable for agriculture; a dwindling percentage of the population are nomadic tribespeople raising sheep and goats. In 1962 a major land-reform program redistributed much of the huge land holdings of absentee landlords to poor, landless peasants in an effort to raise the rural standard of living. Irrigation dams were also built, and the government attempted to establish huge, mechanized commercial farms. Most farms, however, remain small and inefficient. Iran's farm output has not been able to keep pace with demands of the nation's rapidly growing population, although the government is attempting to reduce food imports and guarantee a minimum food security through rationing and food price supports. Commercial fishing is important along the Persian Gulf and in the Caspian Sea, the source of Iran's famous caviar. Transportation Railroads serve the major cities of Tehran, Mashhad, and Tabriz in the north and connect with lines serving Qum, Ahvaz, Bandar Khomeini, Khorramshahr, and Isfahan. The principal highway extends from the Turkish border to Herat, in Afghanistan. The leading ports are Khorramshahr, Bandar Abbas, Bandar Khomeini, and Bushehr. Kharg Island is the main terminus for oil exports. Trade More than 90% of Iranian exports consist of oil and oil products. Other exports include textiles, carpets, cotton, and dried and fresh fruit. In recent times all but the most essential imports have been tied to countertrade (oil for imports). Iran has extended its trade links with Asia. It signed (1986) an agreement of limited economic cooperation with the \TUSSR\t. The revolutionary government has been reluctant to borrow abroad and has repaid almost all of the nation's foreign debt, including claims by U.S. firms that lost assets after the shah's overthrow. HISTORY AND GOVERNMENT Many dynasties and empires have ruled Persia, which at times has been at the center of vast empires extending through much of the Middle East (see \TPersia, ancient\t). The modern Persian state traces its beginnings to \TCyrus the Great\t, who became the first of the \TAchaemenid\t emperors in 549 BC. In 330 BC, Persia became part of Alexander the Great's empire. It was subsequently part of the \TSeleucid\t kingdom and then, beginning in 250 BC, of the Parthian empire (see \TParthia\t). In AD c.224 the Parthian \TArsacid\t dynasty was overthrown by the \TSassanians\t, a Persian dynasty that ruled until the Arab conquest, which was completed in 641. The Arabs introduced Islam and incorporated Persia into the dominions of the caliphs (see \Tcaliphate\t). In the 11th and 12th centuries the country came under the rule of the \TSeljuk\t Turks, who laid down the administrative and economic structure that persisted until the 20th century. Persia was overrun by the \TMongols\t under \TGenghis Khan\t in the 13th century and by \TTimur\t in the late 14th century. In the 16th century, after a long period of disunity, Shah Ismail (r. 1502-24) founded the Safavid dynasty, which restored Persia as a political entity and established Shiism as the national religion. The greatest Safavid ruler was Shah \TAbbas I\t, who reconquered (1603-23) substantial territories from the Ottoman Empire. The Afghans overthrew the Safavids in 1722, but Persian independence was restored (1736) by the despotic Nadir Shah. His Afshar dynasty was followed (1750) by the Zand dynasty, which was overthrown in 1794 by the Qajars (Kajars), who held the throne until 1925. During the 19th century Iran came under increasing pressure from Russia in the north and from Britain, which was pushing westward from India and northward from the Persian Gulf. The Anglo-Russian Entente of 1907 (see \TTriple Entente\t) divided the country into a Russian zone of influence, a British zone, and a neutral zone. In 1908 petroleum was discovered. The decadent Qajar dynasty was unable to save the country from a state of virtual civil war and from foreign domination until the emergence of a strong leader in \TReza Shah Pahlavi\t after World War I. The Majlis (parliament) elevated him to the throne in 1925. He reorganized the military forces, restored internal order, broke the power of the reactionary Shiite clergy, developed new industries, and revised the legal system. In 1941 joint British-Soviet pressure forced the abdication of the allegedly pro-German Reza Shah. He was succeeded by his 22-year-old son, \TMuhammad Reza Shah Pahlavi\t. In the early 1950s the power of the new shah was challenged by the nationalist leader Muhammad \TMosaddeq\t, who tried to take over the government and nationalized the oil industry, previously controlled by foreign interests. The shah was forced to flee the country briefly in 1953, but he returned shortly with strong backing from the Western powers; Mosaddeq was subsequently convicted of treason, and the shah emerged as a powerful and determined ruler. In 1954 a new arrangement with a consortium of Western oil companies was negotiated, giving Iran 50% of all profits (raised to 55% in 1970). In 1963 the shah inaugurated an ambitious program of modernization (including land reform, emancipation of women, and rapid industrialization) known as the White Revolution. The reforms were too much for some and not enough for others and were accompanied by corruption and widespread social dislocation. As opposition grew, particularly among the clergy, order was kept by the army and the secret police, known as Savak. During 1977 and 1978, however, tensions increased and opposition from both the left and right erupted into street rioting. In November 1978 the shah placed Iran under military rule. Opposition continued, however, led from Paris by the exiled Islamic fundamentalist Ayatollah Ruhollah \TKhomeini\t. On Jan. 6, 1979, the shah lifted military rule, and a few days later he left the country. Khomeini returned to a tumultuous welcome on February 1, and on February 12, Iran was proclaimed an Islamic republic. Hundreds of the shah's supporters and alleged members of Savak were arrested, tried, and executed. Khomeini initiated policies to reverse the Westernization of Iran, and a new constitution was overwhelmingly approved at the end of the year, establishing a parliamentary form of government with an elected president and a unicameral parliament, the Sharia (Islamic law) as the basis of the legal system; and a council of guardians dominated by religious leaders. The constitution vested supreme authority in a faghi (supreme religious guide) and made Khomeini faghi for life. The new regime was antagonistic toward the United States because of the latter's longtime support of the shah. The seizure of the U.S. embassy in Tehran and its personnel by military students in November 1979 precipitated a prolonged international crisis (see \TIranian hostage crisis\t) that finally ended with the release of the hostages in January 1981. Meanwhile, in 1980, a border dispute with Iraq erupted into war (see \TIran-Iraq war\t) when Iraqi troops invaded Iran and temporarily gained control of Iran's oil-producing centers in Khuzestan. Although Iranian forces later recaptured the occupied territory, the war continued until 1988, when Iraq and Iran agreed to a cease-fire. Khomeini skillfully used both the hostage crisis and the war with Iraq to unify the country behind him. Abolhassan \TBani-Sadr\t, a moderate who was elected president in January 1980, found his powers increasingly circumscribed by the fundamentalist clerics who held a majority in parliament. In June 1981 he was dismissed. His successor, Muhammad Ali Rajai, was assassinated later that year as the People's Mudjahedeen (a group of socialist Islamic guerrillas) and other opponents of the revolutionary government turned increasingly to violence. Hojatolislam Ali Khamenei was elected president in 1981 and reelected in 1985. Iran's revolutionary government continued to enjoy widespread domestic support despite shortages of food and foreign exchange and political repression. It became increasingly isolated in the international community, however, partly due to its links to \THezbollah\t and other terrorist groups and activities. Signs of differences among the nation's political leaders emerged, particularly after the late 1986 revelations of U.S. arms sales to Iran in the so-called \TIran-contra affair\t. In 1988, Khomeini reluctantly accepted a United Nations-mediated cease-fire in the Iran-Iraq War. In 1987, he encouraged hard-liners by offering $5 million for the death of Salman \TRushdie\t, author of a book considered offensive to Muslims, and forced the resignation of Hussein Ali Montazeri, who had been designated his successor in 1985. After Khomeini's death, on July 3, 1989, the Council of Experts elected Khamenei to succeed him as Iran's supreme religious leader. Hashemi \TRafsanjani\t, the speaker of parliament, became president after July 1989 elections in which voters also approved constitutional amendments abolishing the post of prime minister and strengthening the presidency. Soon after its 1990 invasion of Kuwait, Iraq agreed to return to Iran all prisoners and territory taken during the Iran-Iraq war; the two nations restored diplomatic ties in September. Iran remained neutral during the 1991 \TPersian Gulf War\t and moved to improve relations with Western Europe and the Arab world and to reassert itself as a regional power. Arthur Campbell Turner Bibliography: American University, Iran: A Country Study, 4th ed. (1989); Amuzegar, J., Dynamics of the Iranian Revolution (1991); Arjomand, Said Amir, The Turban for the Crown (1988); Avery, P., et al., eds., The Cambridge History of Iran, 7 vols. (1968-90); Bakhash, S., The Reign of the Ayatollahs (1984; repr. 1986); Bill, J., The Eagle and the Lion (1988); Esposito, J. 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