Persian Gulf

Coordinates: 26°N 52°E / 26°N 52°E / 26; 52
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Persian Gulf
Primary inflows
Gulf of Oman
Basin countriesIran, Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain, United Arab Emirates and Oman (exclave of Musandam)
Max. length989 km (615 mi)
Surface area251,000 km2 (97,000 sq mi)
Average depth50 m (160 ft)
Max. depth90 m (300 ft)
Water volume8,780 km3 (2,100 cu mi)
ISS
, 2020.

The Persian Gulf (

Arabic: اَلْخَلِيْجُ ٱلْعَرَبِيُّ, romanizedAl-Khalīj al-ˁArabī), is a mediterranean sea in West Asia. The body of water is an extension of the Indian Ocean located between Iran and the Arabian Peninsula.[1] It is connected to the Gulf of Oman in the east by the Strait of Hormuz. The Shatt al-Arab river delta
forms the northwest shoreline.

The Persian Gulf has many fishing grounds, extensive

pearl oysters, however its ecology has been damaged by industrialization and oil spills
.

The Persian Gulf is in the Persian Gulf Basin, which is of Cenozoic origin and related to the subduction of the Arabian Plate under the Zagros Mountains.[2] The current flooding of the basin started 15,000 years ago due to rising sea levels of the Holocene glacial retreat.[3]

Geography

The International Hydrographic Organization defines the Persian Gulf's southern limit as "The Northwestern limit of Gulf of Oman". This limit is defined as "A line joining Ràs Limah (25°57'N) on the coast of Arabia and Ràs al Kuh (25°48'N) on the coast of Iran (Persia)".[4]

This inland sea of some 251,000 square kilometres (96,912 sq mi) is connected to the Gulf of Oman in the east by the Strait of Hormuz; and its western end is marked by the major river delta of the Shatt al-Arab, which carries the waters of the Euphrates and the Tigris. In Iran, this is called "Arvand Rud" (lit. Swift River). Its length is 989 kilometres (615 miles), with Iran covering most of the northern coast and Saudi Arabia most of the southern coast. The Persian Gulf is about 56 km (35 mi) wide at its narrowest, in the Strait of Hormuz. Overall, the waters are very shallow, with a maximum depth of 90 metres (295 feet) and an average depth of 50 metres (164 feet).

Countries with a coastline on the Persian Gulf are (clockwise, from north): Iran; Oman's Musandam exclave; the United Arab Emirates; Saudi Arabia; Qatar, on a peninsula off the Saudi coast; Bahrain, an island nation; Kuwait; and Iraq in the northwest. Various small islands also lie within the Persian Gulf, some of which are the subject of territorial disputes between the states in the region.

Exclusive economic zone

Exclusive economic zones in the Persian Gulf:[5][6]

Number Country Area (km2)
1  Iran 97,860
2  United Arab Emirates 52,455
3  Saudi Arabia 33,792
4  Qatar 31,819
5  Kuwait 11,786
6  Bahrain 8,826
7  Oman 3,678
8  Iraq 540
Total Persian Gulf 240,756

Coastlines

Countries by

]:

Number Country Length
1  Iran 1,536
2  Saudi Arabia 1,300
3  United Arab Emirates 900
4  Qatar 563
5  Kuwait 499
6  Bahrain 161
7  Oman 100
8  Iraq 58
Total Persian Gulf 5,117

Islands

The Persian Gulf is home to many islands such as Bahrain, an Arab state. Geographically, the biggest island in the Persian Gulf is

The World Islands in Dubai and The Pearl Island in Doha. Persian Gulf islands are often also historically significant, having been used in the past by colonial powers such as the Portuguese and the British in their trade or as acquisitions for their empires.[7]

Oceanography

The Persian Gulf is connected to the Indian Ocean through the Strait of Hormuz. Writing the water balance budget for the Persian Gulf, the inputs are river discharges from Iran and Iraq (estimated to be 2,000 cubic metres (71,000 cu ft) per second), as well as precipitation over the sea which is around 180 mm (7.1 in)/year in Qeshm Island. The evaporation of the sea is high, so that after considering river discharge and rain contributions, there is still a deficit of 416 cubic kilometres (100 cu mi) per year.[8] This difference is supplied by currents at the Strait of Hormuz. The water from the Persian Gulf has a higher salinity, and therefore exits from the bottom of the Strait, while ocean water with less salinity flows in through the top. Another study revealed the following numbers for water exchanges for the Persian Gulf: evaporation = –1.84 m (6.0 ft)/year, precipitation = 0.08 m (0.26 ft)/year, inflow from the Strait = 33.66 m (110.4 ft)/year, outflow from the Strait = -32.11 m (105.3 ft)/year, and the balance is 0 m (0 ft)/year.[9] Data from different 3D computational fluid mechanics models, typically with spatial resolution of 3 kilometres (1.9 mi) and depth each element equal to 1–10 metres (3.3–32.8 ft) are predominantly used in computer models.

Name

Historical names

Map of the Persian Gulf. The Gulf of Oman leads to the Arabian Sea. Detail from larger map of the Middle East.

Before being given its present name, the Persian Gulf was called many different names. The

Iranian plateau.[11] Consequently, in the Greek sources, the body of water that bordered this province came to be known as the "Persian Gulf".[12] In the book of Nearchus known as Indikê (300 BC), the word "Persikon kolpos" is mentioned for multiple times meaning "Persian gulf".[13]

During the years 550 to 330 BC, coinciding with the sovereignty of the Achaemenid Persian Empire over the Middle East area, especially the whole part of the Persian Gulf and some parts of the Arabian Peninsula, the name of "Persian (Pars) Sea" is widely found in the compiled written texts.[1]

At the same period, there is the inscription and engraving of Darius the Great, which belongs to the fifth century BC:[1] King Darius says:[14]

I ordered to dig this (

Darius the Great's Suez Inscriptions

In

Avestan: Pūitika, lit.'cleansing', a name mentioned in Bundahishn.[15]

a Dubai museum with the word Persian removed[16][17]

Modern naming dispute

The body of water is historically and internationally known as the Persian Gulf.[18][19][20] Arab governments refer to it as the Arabian Gulf or The Gulf,[21] and other countries and organizations have begun using Arabian Gulf.[22] The name Gulf of Iran (Persian Gulf) is used by the International Hydrographic Organization.[23]

The dispute in naming has become especially prevalent since the 1960s.[24] Rivalry between Iran and some Arab states, along with the emergence of pan-Arabism and Arab nationalism, has seen the name "Arabian Gulf" become predominant in most Arab countries.[25][26] Names beyond these two have also been applied to or proposed for this body of water.

History

Ancient history

The region of the Persian Gulf has been inhabited since the Paleolithic.[27] During most of the Last Glacial Period (115,000–11,700 years Before Present), due to lowered sea levels (reaching around 125 metres (410 ft) metres below present values during the Last Glacial Maximum) combined with the shallow depth of the Gulf (on average around 35 metres (115 ft) and at max around 100 metres (330 ft) metres depth) most of the Persian Gulf was exposed as dry land,[28] forming a flat floodplain where a number of rivers converged. This region may have served as an environmental refuge for early humans during periodic hyperarid climate oscillations. The modern marine Gulf was formed when sea level rose during the early Holocene, from around 12,000 to 6,000 years ago. The flooding of the Gulf may have stimulated the development of Neolithic farming cultures in regions of the Middle East adjacent to the Gulf.[27]

Map depicting extent of early civilizations around the Persian Gulf, including Lackhmids and Sassanids.
Map depicting the Achaemenid Persian empire in relation to the Persian Gulf.
A painting depicting the British Expeditionary Force off the coast of Ras Al Khaimah in 1809.

The world's oldest known civilization (Sumer) developed along the Persian Gulf and southern Mesopotamia.[29] The oldest evidence in the world for seagoing vessels has been found at H3 in Kuwait, dating to the mid-sixth millennium BC, when the Gulf was part of an extensive trade network that involved the Ubaid settlements in Mesopotamia and communities along the entire Gulf coast.[30]

For most of the early history of the settlements in the Persian Gulf, the southern shores were ruled by a series of nomadic tribes. During the end of the

Sassanid Persian empire
conquered the whole of the Persian Gulf, including southern and northern shores.

Between 625 BC and 226 AD, the northern side was dominated by a succession of Persian empires including the

Tigris, and the Nile in the west, as well as Sind waterway, in India.[32]

The Achaemenid high naval command had established major naval bases located along Shatt al-Arab river, Bahrain, Oman, and Yemen. The Persian fleet would soon not only be used for peacekeeping purposes along the Shatt al-Arab but would also open the door to trade with India via Persian Gulf.[32][33]

Following the fall of Achaemenid Empire, and after the fall of the

Siraf, an ancient Sassanid port that was located on the northern shore of the Persian Gulf, located in what is now the Iranian province of Bushehr, is an example of such commercial port. Siraf, was also significant in that it had a flourishing commercial trade with China by the fourth century, having first established connection with the far east in 185 AD.[34]

Colonial era

Portuguese influence in the Persian Gulf lasted for 250 years;

. "Lendas da Índia", c. 1556)

Pirate Coast
'. From 1763 until 1971, the
British Residency of the Persian Gulf
.

Modern history

Operation Earnest Will: Tanker convoy No. 12 under US Navy escort in October 1987

The Persian Gulf was a battlefield of the 1980–1988 Iran–Iraq War, in which each side attacked the other's oil tankers. It is the namesake of the 1991 Gulf War, the largely air- and land-based conflict that followed Iraq's invasion of Kuwait. The United States' role in the Persian Gulf grew in the second half of the Twentieth Century.[47] On July 3, 1988, Iran Air Flight 655 was shot down by the U.S. military (which had mistaken the Airbus A300 operating the flight for an Iranian F-14 Tomcat) while it was flying over the Persian Gulf, killing all 290 people on board.[48] The United Kingdom maintains a profile in the region; in 2006 alone, over 1 million British nationals visited Dubai.[49][50] In 2018, the UK opened a permanent military base, HMS Jufair, in the Persian Gulf, the first since it withdrew from East of Suez in 1971 and is developing a support facility in Oman.[51][52][53]

Cities and population

Eight nations have coasts along the Persian Gulf: Bahrain, Iran, Iraq, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates. The Persian gulf's strategic location has made it an ideal place for human development over time. Today, many major cities of the Middle East are located in this region.

Wildlife

The wildlife of the Persian Gulf is diverse, and entirely unique because of the Persian Gulf's geographic distribution and its isolation from the international waters only breached by the narrow Strait of Hormuz. The Persian Gulf has hosted some of the most magnificent marine fauna and flora, some of which are near extirpation or at serious environmental risk. From corals, to dugongs, Persian Gulf is a diverse cradle for many species who depend on each other for survival. However, the Persian Gulf is not as biologically diverse as the Red Sea.[54]

Overall, the wildlife of the Persian Gulf is endangered from both global factors, and regional, local negligence. Most pollution is from ships; land generated pollution counts as the second most common source of pollution.[55]

Aquatic mammals

Along the

Indo-Pacific humpbacked dolphins.[75][76][77]

One of the more unusual marine mammals living in the Persian Gulf is the

whales.[78] Their simple grass diet is negatively affected by new developments along the Persian Gulf coastline, particularly the construction of artificial islands by Arab states and pollution from oil spills caused during the "Persian Gulf war" and various other natural and artificial causes. Uncontrolled hunting has also had a negative impact on the survival of dugongs.[78] After Australian waters, which are estimated to contain some 80,000 dugong inhabitants, the waters off Qatar, Bahrain, UAE, and Saudi Arabia make the Persian Gulf the second most important habitat for the species, hosting some 7,500 remaining dugongs. However, the current number of dugongs is dwindling, and it is not clear how many are currently alive or what their reproductive trend is.[78][79]
Ambitious and uncalculated construction schemes, political unrest, ever-present international conflict, the most lucrative world supply of oil, and the lack of cooperation between Arab states and Iran, have had a negative impact on the survival of many marine species, including dugongs.

Birds

The Persian Gulf is also home to many migratory and local birds. There is great variation in color, size, and type of the bird species that call the Persian Gulf home. Concerns regarding the endangerment of the kalbaensis subspecies of the collared kingfishers were raised by conservationists over real estate development by the United Arab Emirates and Oman.[80] Estimates from 2006 showed that only three viable nesting sites were available for this ancient bird, one located 80 miles (129 km) from Dubai, and two smaller sites in Oman.[80] Such real estate expansion could prove devastating to this subspecies. A UN plan to protect the mangroves as a biological reserve was ignored by the emirate of Sharjah, which allowed the dredging of a channel that bisects the wetland and construction of an adjacent concrete walkway.[80] Environmental watchdogs in Arabia are few, and those that do advocate the wildlife are often silenced or ignored by developers of real estate many of whom have governmental connections.[80]

Real estate development in the Persian Gulf by the United Arab Emirates and Oman also raised concerns that habitats of species such as the

Hormozgan province, which are not well understood, but are suspected to be linked with a deteriorating marine environment from water pollution from oil, sewage, and industrial run offs.[82][83]

Fish and reefs

The Persian Gulf is home to over 700 species of fish, most of which are native.

global warming but mostly to irresponsible dumping by Arab states like the UAE and Bahrain.[88] Construction garbage such as tires, cement, and chemical by products have found their way to the Persian Gulf in recent years. Aside from direct damage to the coral, the construction waste creates "traps" for marine life in which they are trapped and die.[88]
The result has been a dwindling population of the coral, and as a result a decrease in number of species that rely on the corals for their survival.

Flora

A great example of this

mangroves in the Persian Gulf, which require tidal flow and a combination of fresh and salt water for growth, and act as nurseries for many crabs, small fish, and insects; these fish and insects are the source of food for many of the marine birds that feed on them.[80] Mangroves are a diverse group of shrubs and trees belonging to the genus Avicennia or Rhizophora that flourish in the salt water shallows of the Persian Gulf, and are the most important habitats for small crustaceans that dwell in them. They are as crucial an indicator of biological health on the surface of the water, as the corals are to biological health of the Persian Gulf in deeper waters. Mangroves' ability to survive the salt water through intricate molecular mechanisms, their unique reproductive cycle, and their ability to grow in the most oxygen-deprived waters have allowed them extensive growth in hostile areas of the Persian Gulf.[89][90]
However, with the advent of artificial island development, most of their habitat is destroyed, or occupied by man-made structures. This has had a negative impact on the crustaceans that rely on the mangrove, and in turn on the species that feed on them.

Gallery

Oil and gas

Oil and gas pipelines and fields

The Persian Gulf and its coastal areas are the world's largest single source of petroleum,

oilfield, is located in the Persian Gulf. Large gas finds have also been made, with Qatar and Iran sharing a giant field across the territorial median line (North Field in the Qatari sector; South Pars Field in the Iranian sector). Using this gas, Qatar has built up a substantial liquefied natural gas
(LNG) and petrochemical industry.

In 2002, the Persian Gulf nations of Bahrain, Iran, Iraq, Kuwait, Qatar, Saudi Arabia, and the UAE produced about 25% of the world's oil, held nearly two-thirds of the world's crude oil reserves, and about 35% of the world's natural gas reserves.[92][93] The oil-rich countries (excluding Iraq) that have a coastline on the Persian Gulf are referred to as the Persian Gulf States. Iraq's egress to the Persian Gulf is narrow and easily blockaded, consisting of the marshy river delta of the Shatt al-Arab, which carries the waters of the Euphrates and the Tigris rivers, where the east bank is held by Iran.

See also

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