The Persian Gulf is a waterway that runs along the Sea of Oman between Iran and the Arabian Peninsula. It covers an area of 237,473 km2 and is the third largest in the world after the Gulf of Mexico and the Gulf of Hudson. From east, Persian Gulf is connected to to the Indian Ocean and the Arabian Sea through the Strait of Hormuz and the Sea of Oman. Persian Gulf is bordered by Iran, Oman, Iraq, Saudi Arabia, Kuwait, the United Arab Emirates, Qatar and Bahrain. Meanwhile, the northern shores of the Persian Gulf are all part of Iran’s political geography. Due to the rich oil and gas resources in the Persian Gulf and its shores, this waterway is considered an important and strategic area at the international level.


Persian Gulf Beauty


The historical name of this gulf, in various languages, has been the translation of the phrase “Persian Gulf” or “Persian Sea”. Also, in all legal international organizations, the official name of this bay is “Persian Gulf”, but some Arab countries have recently tempted to call it the “Arabian Gulf” or simply the Gulf. The International Hydrographic Organization (IHO) uses the name “Iranian Gulf” for this bay.


Geology of the Persian Gulf

Geologists believe that about 500,000 years ago, the primitive form of the Persian Gulf was formed along the southern plains of Iran, and over time, due to changes in the internal and external structure of the earth, it found its current constant form. The present-day Persian Gulf, together with its northwestern continuation now infilled by the deposits of the Mesopotamian rivers, is the remains of a once much larger basin of deposition aligned northwest to southeast that existed throughout much of geologic history.

In the beginning, the Persian Gulf was so vast that by the end of the third geological period, most of the plains of Borazjan, Behbahan, and Khuzestan of Iran were submerged up to the Zagros Mountains. In this basin vast quantities of sediments accumulated—mostly limestone and marls (a mixture of calcareous and silicate mud), together with evaporites and organic matter—which ultimately produced the area’s extensive oil resources.


Climate of the Persian Gulf

The climate of the Persian Gulf is dry and semi-tropical. Temperatures are high in summer and it sometimes reaches 50 degrees Celsius, so that the rate of evaporation would be higher than the amount of water input. Though winters may be quite cool at the northwestern extremities and the temperature is reported to be as low as 3 degrees Celsius.

In addition to the high salinity of the gulf, there are 200 freshwater springs on the bottom and 25 completely fresh water springs on its shores, all of which originate from the Zagros Mountains in Iran. The freshwater that enters the Persian Gulf is mainly confined to the runoff of the Zagros Mountains in Iran and the mountains of Turkey and Iraq.


Rivers Flowing to The Persian Gulf 

The Arvand, Karun, Jarahi, Mand, Dalaki and Minab rivers are the largest and most abundant rivers flowing into the Persian Gulf, most of which originate in the Zagros Mountains. In the southern coast, the number of waters entering the Gulf is very low, which has led to high carbonate sediments in this area. Due to its enclosure, the effect of the ocean on the gulf is very small, and therefore the speed of its lower and horizontal currents is very low, about 10 cm per second. The greater salinity of the Gulf than the ocean gives rise to the flow of water from the Indian Ocean to the Gulf, which runs parallel to the coast of Iran and in a counter-clockwise direction.


persian gulf old mapPersian Gulf Old Map in French – 1748


Persian Gulf Iranian Islands

There are many islands in the Persian Gulf, some of which are of little importance and some are strategical for the country economy. Most of these important islands belong to Iran such as Qeshm, Kish, Khark, Abu Musa, Tonb-e Bozorg, Tonb-e Kuchak, Hormuz and Lavan Island. Among these islands, more than 30 residential and non-residential islands belong to Iran. Some of these islands get regularly submerged due to the tide. These uninhabited islands are of special global importance as habitats for corals, nests of sea swallows and turtles, as well as habitats for migratory birds. The largest island of the Persian Gulf is called Qeshm.


Qeshm Island

Qeshm Island, known as the largest island of Iran and of the Persian Gulf, is one of the islands of the Hormozgan Province and lies in the Strait of Hormuz. Qeshm Island has been considered one of the top tourist destinations in Iran in recent years. Qeshm is full of natural and extraordinary attractions which can’t be found anywhere in Iran. The natural and historical attractions, along with the culture of the island’s indigenous people have made a great number of visitors visit Qeshm as their destination of choice every year. Below we will get acquainted with the most important tourist attractions in Qeshm. Travel to Qeshm is feasible by sea and air. Qeshm has an international airport. It should be noted that this airport is a hub of Qeshm Airlines. Due to the weather conditions of Qeshm Island, the best time to travel to this island is in autumn and in winter. Qeshm in winter brings a mild climate experience with an average of 24 degrees Celsius.


chahkuh qeshmQeshm Island, Iran


Hormuz Island

The island of Hormuz is refereed to as the small island of the Persian Gulf. It is a picturesque island full of different colors, with a completely different culture so that you enter another planet as you enter Hormuz. Hormuz Island, land of colors and wonders, boasts spectacular landscapes from colorful soils to extraordinary architecture, with a fascinating story to hear and a sight to behold. It is interesting to know that the soil of Hormuz can be seen in seventy different colors, an eatable soil with healing effects which is one of the wonders of this place. By the 14th century, the population of the island was 7,000 people, and Hormuz was known as a commercial city by the river Minab. It is interesting to know that when the Mongols invaded Iran, around 700 years ago, Hormuz Island was a city at the mouth of the river Minab. After the Mongol invasion, the fifteenth ruler of Hormuz and inhabitants fled the town and took their refuge first to Kish Island and then to Laron. Hormuz Island is an oval-shaped, dome-shaped island with an  area of 42 square kilometers at the entrance to the Persian Gulf and 2 kilometers to Bandar Abbas. The island of Hormuz is considered the key to the Gulf because of its geographical location and its proximity to the Strait of Hormuz. It is in this context that Hormuz Island has historically been particularly important in Qeshm, both geographically and commercially. Colorful mountains, cliffs formed over millions of years of erosion, magnificent salt rocks and, most of all, red soil – these are spectacular attractions on the island of Hormuz, so traveling to Hormuz Island, especially in the cold seasons, can be the best choice for a pleasant and dreamy trip. Be it. Make sure to include Hormuz Island in your tour list. The island will amaze you with its beauties.


Hormuz islandHormuz Island, Iran


Kish Island

Kish Island, often called the Pearl of the Persian Gulf has an area of 90 square km (36 sq. miles). It is known for being a beautiful resort in the Middle East and in Iran. Kish Island has relaxed laws in comparison to the rest of Iran. Like mainland Iran, the people of Kish are friendly and hospitable. has a very hot climate due to geographical and regional conditions. In fact, summers on this island are very long and sometimes reach up to 95% humidity. In Kish you will rarely see rain except in winter and in the form of rainstorms. Therefore, it can be said that the best month to travel and stay in Kish is between January and May, where you can escape the cold in other parts of the country and seek refuge in the cool air of Kish. Interesting thing about Kish climate is that the oxygen on the island is pure that even pulmonary patients do not need to use oxygen capsules and this feature is only available in five locations around the world. The average annual temperature of this beautiful island is about 24 degrees Celsius. Most of the island’s vegetation is composed of palm trees, although native to the trees are Persian Kahur, Eucalyptus, Acacia and Albizia lebbeck. Most of the vegetation and trees in this area are resistant against heat and dehydration.



Why is the Persian Gulf important?

The biggest importance of the Persian Gulf is the existence of rich oil and gas resources on the the sea bed and its shores, so that this area is called the “World Oil Reservoir”. This Gulf is a transit route for oil from Iran, Iraq, Kuwait, Saudi Arabia and the United Arab Emirates, and is therefore an important and strategic region. About 30 percent of the world’s oil is supplied from this region, which sometimes increases and sometimes decreases. Oil produced in the Persian Gulf must be transported through the Strait of Hormuz.

In terms of oil resources, the Persian Gulf has many advantages over other parts of the world, such as ease of extraction, low production costs, excess production capacity, high quality of crude oil, ease of transportation, high production capacity of wells and the possibility of discovering new vast oil reserves. According to the latest statitstics, Persian Gulf reserves about 730 billion barrels of oil reserves and more than 70 trillion cubic meters of natural gas. There are also important ports on the Persian Gulf, including Bandar Abbas, Bushehr, Bandar Lengeh, Kish, Khorramshahr and Mahshahr port in Iran, and Sharjah, Dubai and Abu Dhabi in the United Arab Emirates, and the ports of Basra and Al-Faw port in Iraq.


Kish islandLeft: Aground Greek Ship, Kish, Iran    |    Right: Hormuz Island Shore, Iran



Persian Gulf Fauna

The Persian Gulf is one of the largest habitats for marine organisms such as corals, small ornamental fish, edible and non-edible fish, oysters, snails, mollusks, sea anemones, sea sponges, Jelly fish, turtles, many dolphins and sharks. Environmentalists are concerned about endangered various species of mammals in the water pollution and lack of sufficient knowledge. Drought and lack of nutrients entering the water have caused some Persian Gulf aquatic species to remain underdeveloped.


1Persian Gulf Fish

907 different species of fish are found in the Persian Gulf. Most of the these aquatic animals live in salty waters, except for a few that enter the fresh waters of Karun, Bahman Shir and Arvand rivers, where they lay eggs and reproduce. The most important types of commercial fish in the Persian Gulf are Silver pomfret (Pampus argenteus), Indo-Pacific king mackerel (Scomberomorus guttatus), The narrow- barred Spanish mackerel (Scomberomorus commerson), Javelin grunt (Pomadasys kaakan), Redmouth grouper (Aethaloperca rogaa ), Parrotfish, Black pomfret, Drums (Sciaenidae), Ilish, Flounders, and Snappers. Other valuable food products in the Persian Gulf include shrimp. A variety of edible oysters are also found on some beaches, such as Bandar Abbas Beach and Gasheh Beach (Oyster Beach) in the port of Lengeh, as well as around some islands such as Hormoz, Qeshm and Lark, the main markets of which are European countries.


fishing in Persian gulf


Iran is the largest fishery producer in the region, with a 2,440 km coastline along the Persian Gulf and Oman Sea, and a 740 km coastline in the north along the southern part of the Caspian Sea.There are many fish landing areas in southern Iran, distributed all along the coastline, and despite gradually increasing effort, the total catch has fluctuated in recent years.



2Persian Gulf turtles

Five of the eight species of existing turtles in the world live in the waters of the Persian Gulf and the Sea of Oman. Two species of eagle turtles

and green turtles lay their eggs on the coasts and islands of Iran. These two turtles live on the coasts of islands such as Hormuz, Lark, Qeshm, and shallow coastal areas, and their main spawning sites are on the islands of Hormuz, Hengam, Farur, Shidur, Lavan, and Kish. Fishing activities, the presence of garbage, sewage and oil pollution is poisoning the Persian Gulf turtle population.



3Persian Gulf dolphins and whales

Dolphins and whales are among the mammals that live in this gulf and the Sea of Oman. Bottlenose dolphins, as well as Porpoises live

in the south of Qeshm Island, near the islands of Hengam, Salarak and Hormuz – Places that are exposed to various dangers.

Lack of adequate research and lack of expertise have reduced the number of Humpback whales and gray whales. The collision of dolphins and whales with boats and their Propellers , as well as the pollution of some parts of the Persian Gulf with oil and chemical pollutants, threaten the lives of these mammals. According to some reports, the Persian Gulf whale is in danger of extinction.


Persian gulfLeft: Scuba Diving in Kish Island, Iran    |    Right: Hengam Island Dolphins



4Sharks of the Persian Gulf

Sharks are a group of cartilaginous fish with a spindle-shaped body whose ancestors lived 450 million years ago. Sharks are one of the most valuable aquatic animals, which have long been chased for their profitable use of meat, vitamin-rich oils, fins, skin, and teeth. On the other hand, because of misunderstanding and unnecessary fear of this animal , they have been brutally invaded by humans.

These animals have the largest liver among all aquatic animals and use an organ called “Ampullae of lorenzini” to receive their prey’s electric field. The fish also have heat exchangers deep in their muscles that keep their body temperature above 10 degrees C more than the environment water heat.


hara forest tree


Seven species of sharks live in the waters of the Persian Gulf, including Requiem sharks (Carcharhinidae), Long-tailed carpet sharks, whale sharks (Rincodon tidae), Scalloped hammed head (Sphranidae),  Houndsharks (Triakidae), Zebra Sharks (Stegostomatidae) , and zebra sharks. Due to the high price of sharks compared to other fish in the Persian Gulf, overfishing has increased dramatically in recent years, putting their offspring at risk of extinction. Since most shark species living in the Persian Gulf are living, it is not possible to develop a good program to revive their offspring. Also, these sharks move to shallower bodies (which provide the lowest temperature for their offspring) at birth, and increasing the destruction of coastal areas is another threat to their offspring’s survival.

Mangrove forest of Qeshm gets submerged at night due to the tide, in the salty waters of the sea, and during the day it emerges from the water. Harra Forest has certain types of trees whose roots sweeten the salty water and feed the tree.


Persian Gulf National Day

One of the steps taken by the Iranian government to protect the spiritual and cultural heritage of the Persian Gulf was to recognize the Persian Gulf National Day in the country’s official calendar. In this regard, in July 2005, the Supreme Council of the Cultural Revolution named April 29th, which coincides with the expulsion of the Portuguese from the Strait of Hormuz, as the National Day of the Persian Gulf.


Persian Gulf or Arabian Gulf?

Historically, the name Persian Gulf (Khalīj-e Fārs) has been used by ancient geographers and historians as a name that finds its way in popular usage through the ages. In the mid-20th century, however, some Arab states around the Persian gulf suggested that the proper name for the gulf is Arabian Gulf. The dispute escalated to the extent that Iran banned publications using this unusual term. Both parties have extended historic proof to support their individual claims. Most independent writers and publications now prefer to merely call it The Gulf or the Gulf of Basra.

Most prominent nations such as the US continued to refer to it as the Persian Gulf untill about 2010. Recent (unofficial) references to the Arabian Gulf, however, have been viewed as a political stance rather than support of the Arab claim. The Eighth United Nations Conference on the Standardization of Geographical Names held in Berlin in August- September 2002, clear the UN stance. According to the UN the use of Arabian Gulf is faulty and the name Persian Gulf is the correct name. The International Hydrographic Organization (IHO), the organization responsible for naming water bodies across the globe refers to the gulf as “Gulf of Iran (Persian Gulf)” lending authenticity to Iran’s claim.Despite the dispute most famous atlases continue to call the gulf “Persian Gulf”.

As a conclusion, the name Persian Gulf is more than 2,000 years old and the issue of forging the name of the Persian Gulf is as young as the countries that insist on it.



Fast Facts 

  • Apart from the Persian Gulf, Iran also has a common border with the Oman Sea and the Caspian Sea, but most of Iran’s residential or tourist islands are located on the gulf.
  • Geologists believe that 500 thousand years ago, the southern plateau of Iran was the primary origin of the gulf.
  • There are beliefs that the Achaemenid Empire gave the name Persia to this gulf around 550 BC.
  • The coastlines of the Persian Gulf include one of the largest sources of crude oil in the world.
  • Apart from oil and gas, the waters of the Persian Gulf are considered as one of the important sources of pearl fishing.
  • Until the mid-20th century, there were no documents in history that mentioned the Persian Gulf as the Arabian Gulf.
  • More than 900 species of fish live in the Persian Gulf, a significant number of which are endemic.
  • George Ryan Reynolds, an English geologist, first discovered oil in the Persian Gulf (in Iran) in 1909.
  • The Persian Gulf region has about 130 large and small islands, the northern islands of which belong to Iran and are more or less populated, while the south and northwest islands, which belong to Arab countries, are mostly coral and rocky and uninhabited.
  • Qeshm is the only natural geopark in Iran and the Middle East, with an area of ​​more than 1,500 km2.