Geography of Iran

Iran at night

Topography of Iran

The topography of Iran consists of rugged, mountainous rims surrounding high interior basins. The main mountain chain is the Zagros Mountains, a series of parallel ridges interspersed with plains that bisect the country from northwest to southeast. Many peaks in the Zagros exceed 3,000 metres (9,843 ft) above sea level, and in the south-central region of the country there are at least five peaks that are over 4,000 metres (13,123 ft).

As the Zagros continue into southeastern Iran, the average elevation of the peaks declines dramatically to under 1,500 metres (4,921 ft). Rimming the Caspian Sea littoral is another chain of mountains, the narrow but high Alborz Mountains. Volcanic Mount Damavand, 5,610 metres (18,406 ft), located in the center of the Alborz, is not only the country's highest peak but also the highest mountain on the Eurasian landmass west of the Hindu Kush.

The center of Iran consists of several closed basins that collectively are referred to as the Central Plateau. The average elevation of this plateau is about 900 metres (2,953 ft), but several of the mountains that tower over the plateau exceed 3,000 metres (9,843 ft). The eastern part of the plateau is covered by two salt deserts, the Dasht-e Kavir (Great Salt Desert) and the Dasht-e Lut. Except for some scattered oases, these deserts are uninhabited.

Parts of northwestern Iran are part of the Armenian highlands, which adjoins it topographically with other parts of neighbouring Turkey, Armenia, Azerbaijan, and Georgia.[4]

Iran has only two expanses of lowlands: the Khuzestan Plain in the southwest and the Caspian Sea coastal plain in the north. The former is a roughly triangular-shaped extension of the Mesopotamia plain and averages about 160 kilometres (99 mi) in width. It extends for about 120 kilometres (75 mi) inland, barely rising a few meters above sea level, then meets abruptly with the first foothills of the Zagros. Much of the Khuzestan plain is covered with marshes.

The Caspian plain is both longer and narrower. It extends for some 640 kilometres (400 mi) along the Caspian shore, but its widest point is less than 50 kilometres (31 mi), while at some places less than 2 kilometres (1.2 mi) separate the shore from the Alborz foothills. The Persian Gulf coast south of Khuzestan and the Gulf of Oman coast have no real plains because the Zagros in these areas come right down to the shore.

There are no major rivers in the country. Of the small rivers and streams, the only one that is navigable is the 830 kilometres (520 mi)-long Karun, which shallow-draft boats can negotiate from Khorramshahr to Ahvaz, a distance of about 180 kilometres (110 mi). Other major rivers include the Karkheh, spanning 700 kilometres (430 mi) and joining the Tigris; and the Zayandeh River, which is 300 kilometres (190 mi) long. Several other permanent rivers and streams also drain into the Persian Gulf, while a number of small rivers that originate in the northwestern Zagros or Alborz drain into the Caspian Sea.

On the Central Plateau, numerous rivers—most of which have dry beds for the greater part of the year—form from snow melting in the mountains during the spring and flow through permanent channels, draining eventually into salt lakes that also tend to dry up during the summer months. There is a permanent salt lake, Lake Urmia (the traditional name, also cited as Lake Urmiyeh, to which it has reverted after being called Lake Rezaiyeh under Mohammad Reza Shah), in the northwest, whose brine content is too high to support fish or most other forms of aquatic life. There are also several connected salt lakes along the Iran-Afghanistan border in the province of Baluchestan va Sistan.

Iran has a variable climate. In the northwest, winters are cold with heavy snowfall and subfreezing temperatures. Spring and fall are relatively mild, while summers are dry and hot. In the south, winters are mild and the summers are very hot, having average daily temperatures in July exceeding 38 °C (100.4 °F). On the Khuzestan Plain, summer heat is accompanied by high humidity.

In general, Iran has a continental climate in which most of the relatively scant annual precipitation falls from October through April. In most of the country, yearly precipitation averages 850 millimetres (33.5 in). The major exceptions are the higher mountain valleys of the Zagros and the Caspian coastal plain, where precipitation averages at least 1,000 millimetres (39.4 in) and usually in the form of snow. In the western part of the Caspian, rainfall exceeds 1,500 millimetres (59.1 in) annually and is distributed relatively evenly throughout the year. This contrasts with some basins of the Central Plateau that receive ten centimeters or less of precipitation. Iran is considered colder than neighboring countries such as Turkey and Armenia, due to its higher elevation.

Iran climate map showing locations of province capitals

Caspian mild and wet   Caspian mild   Mediterranean with spring rains   Mediterranean   Cold mountains   Very cold mountains   Cold semi-desert   Hot semi-desert   Dry desert   Hot dry desert   Hot coastal dry   Coastal dry

Map of biotopes of Iran

  Forest steppe

  Forests and woodlands

  Semi-desert

  Desert lowlands

  Steppe

  Salted alluvial marshes

7% of the country is forested. The most extensive growths are found on the mountain slopes rising from the Caspian Sea, with stands of oak, ash, elm, cypress, and other valuable trees. On the plateau proper, areas of scrub oak appear on the best-watered mountain slopes, and villagers cultivate orchards and grow the plane tree, poplar, willow, walnut, beech, maple, and mulberry. Wild plants and shrubs spring from the barren land in the spring and afford pasturage, but the summer sun burns them away. According to FAO reports,[5] the major types of forests that exist in Iran and their respective areas are:

1. Caspian forests of the northern districts – 19,000 km² (7,300 sq mi)
2. Limestone mountainous forests in the northeastern districts (Juniperus forests) – 13,000 km² (5,000 sq mi)
3. Pistachio forests in the eastern, southern and southeastern districts – 26,000 km² (10,000 sq mi)
4. Oak forests in the central and western districts – 35,000 km² (14,000 sq mi)
5. Shrubs of the Kavir (desert) districts in the central and northeastern part of the country – 10,000 km² (3,900 sq mi)
6. Sub-tropical forests of the southern coast, like the Hara forests – 5,000 km² (1,900 sq mi)

Wildlife of Iran is diverse and composed of several animal species including bears, gazelles, wild pigs, wolves, jackals, panthers, Eurasian lynx, and foxes. Domestic animals include, sheep, goats, cattle, horses, water buffalo, donkeys, and camels. The pheasant, partridge, stork, eagles and falcon are also native to Iran.

As of 2001, 20 of Iran's mammal species and 14 bird species are endangered. Among them are the Baluchistan bear (Ursus thibetanus gedrosianus), a subspecies of Asian black bear, Persian fallow deer, Siberian crane, hawksbill turtle, green turtle, Oxus cobra, Latifi's viper, dugong and dolphins. The Asiatic cheetah is a critically endangered species which is extinct elsewhere and now can only be found in central to northeastern parts of Iran.

Iran lost all its Asiatic lions and Caspian tigers by the earlier part of the 20th century. The Syrian wild ass has become extinct. Syrian brown bears in the mountains, wild sheep and goats, gazelles, Persian onagers, wild pigs, Persian leopards, and foxes abound. Domestic animals include sheep, goats, cattle, horses, water buffalo, donkeys, and camels. The pheasant, partridge, stork, and falcon are native to Iran.

The Persian leopard is said to be the largest of all the subspecies of leopards in the world. The main range of this species in Iran closely overlaps with that of bezoar ibex. Hence, it is found throughout Alborz and Zagros mountain ranges, as well as smaller ranges within the Iranian plateau. The leopard population is very sparse, due to loss of habitat, loss of natural prey, and population fragmentation.[6] Apart from bezoar ibex, wild sheep, boar, deer, (either Caspian red deer or roe deer), and domestic animals constitute leopards' diet in Iran.

Natural hazards: periodic droughts, floods; dust storms, sandstorms; earthquakes along western border and in the northeast

Environment – current issues: air pollution, especially in urban areas, from vehicle emissions, refinery operations, and industrial effluents; deforestation; desertification; oil pollution in the Persian Gulf; wetland losses from drought; soil degradation (salination); inadequate supplies of potable water in some areas; water pollution from raw sewage and industrial waste; urbanization.

Iranian provinces' contribution to GDP. Tehran host 45% of Iran's industries.[14]

Natural resources: petroleum, natural gas, coal, chromium, copper, iron ore, lead, manganese, zinc, sulfur
arable land: 10.87%
permanent crops: 1.19%
other: 87.93% (2012 est.)

Irrigated land: 87,000 km² (34,000 sq mi) (2009)

Total renewable water resources: 137 km³ (2011)

Freshwater withdrawal (domestic/industrial/agricultural):
total: 93.3 km³/yr (7%/1%/92%)
per capita: 1,306 m³/yr (2004)

Area[15]:
total: 1,648,195 km² (636,372 sq mi)
land: 1,531,595 km² (591,352 sq mi)
water: 116,600 km² (45,000 sq mi)

Land boundaries:
total: 5,894 kilometres (3,662 mi)
border countries: Afghanistan 921 kilometres (572 mi), Armenia 44 kilometres (27 mi), Azerbaijan-proper 432 kilometres (268 mi), Azerbaijan-Nakhchivan exclave 179 kilometres (111 mi), Iraq 1,599 kilometres (994 mi), Pakistan 959 kilometres (596 mi), Turkey 534 kilometres (332 mi), Turkmenistan 1,148 kilometres (713 mi).

Maritime boundaries: Qatar, Saudi Arabia, United Arab Emirates, Bahrain, Kuwait, Oman

Coastline: 2,815 kilometres (1,749 mi)
note: Iran also borders the Caspian Sea, for 740 kilometres (460 mi)

Maritime claims:
territorial sea: 12 nmi (22.2 km; 13.8 mi)
contiguous zone: 24 nmi (44.4 km; 27.6 mi)
exclusive economic zone: 168,718 km² (65,142 sq mi) with bilateral agreements, or median lines in the Persian Gulf
continental shelf: natural prolongation

Elevation extremes:
lowest point: Caspian Sea −28 metres (−92 ft)
highest point: Mount Damavand 5,610 metres (18,410 ft)

•  This article incorporates public domain material from the Library of Congress Country Studies website http://lcweb2.loc.gov/frd/cs/.
•  This article incorporates public domain material from the CIA World Factbook website https://www.cia.gov/the-world-factbook/.

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