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Red Sea: the story on HearLore | HearLore
Red Sea
The Red Sea is a sea inlet of the Indian Ocean, lying between Africa and Asia, yet its name has puzzled historians for millennia. The English term Red Sea is a direct translation of the Ancient Greek Erythrà Thálassa, but the origin of the color remains a subject of intense debate. One theory favored by modern scholars suggests the name refers to the seasonal blooms of the red-colored Trichodesmium erythraeum near the water's surface, while another posits that the name signifies the direction south, just as the Black Sea's name may refer to the north. This ambiguity is compounded by the fact that the sea itself was once referred to as the Erythraean Sea by Europeans, and the Romans called it Pontus Herculis, or the Sea of Hercules. The biblical Book of Exodus tells the account of the Israelites' crossing of the sea, which the Hebrew text calls Yam Suph, and it was made explicit in the Septuagint translation of the Book of Exodus from Hebrew to Koine Greek in approximately the third century BC that Yam Suph is translated as Erythra Thalassa. The sea has been known by many names, including Mare Rubrum in Latin, and the Arabic Al-Bahr Al-Ahmar, but the mystery of its name persists, adding a layer of historical intrigue to its physical reality.
Ancient Routes and Empires
The earliest known exploration of the Red Sea was conducted by ancient Egyptians, as they attempted to establish commercial routes to Punt, with one such expedition taking place around 2500 BC and another around 1500 BC during the reign of Queen Hatshepsut. These voyages were long and perilous, yet they laid the groundwork for the sea's future as a critical trade artery. In the 6th century BC, Darius the Great, a prominent ruler of the Achaemenid Empire in Persia, undertook significant efforts to improve and extend navigation in the Red Sea, sending reconnaissance missions to explore the area and identify navigational hazards. Darius also constructed a canal linking the Nile River to the northern end of the Red Sea at Suez, a precursor to the modern Suez Canal. This canal was a pivotal development, facilitating trade and communication between the Nile Valley and the Red Sea, and beyond to the Indian Ocean. The construction of the canal during Darius's reign is evidenced by ancient records, including inscriptions on stelae that described the construction and its benefits. In the late 4th century BC, Alexander the Great sent Greek naval expeditions down the Red Sea to the Indian Ocean, and Greek navigators continued to explore and compile data on the sea. The Periplus of the Erythraean Sea, a Greek periplus written by an unknown author around the 1st century, contains a detailed description of the Red Sea's ports and sea routes, including how Hippalus first discovered the direct route from the Red Sea to India. The Red Sea was favored for Roman trade with India starting with the reign of Augustus, when the Roman Empire gained control over the Mediterranean, Egypt, and the northern Red Sea. The route had been used by previous states but grew in the volume of traffic under the Romans, with goods from China being introduced to the Roman world. Contact between Rome and China depended on the Red Sea, but the route was broken by the Aksumite Empire around the 3rd century AD. From antiquity until the 20th century, the Red Sea was also a trade route for the Red Sea slave trade from Africa to the Middle East.
The Red Sea is a sea inlet of the Indian Ocean lying between Africa and Asia. It serves as a critical trade artery connecting the Mediterranean Sea to the Indian Ocean.
How did the Red Sea get its name and what theories explain the color?
The English term Red Sea is a direct translation of the Ancient Greek Erythrà Thálassa. One theory suggests the name refers to seasonal blooms of the red-colored Trichodesmium erythraeum, while another posits that the name signifies the direction south.
When was the Red Sea first explored and by whom?
The earliest known exploration of the Red Sea was conducted by ancient Egyptians around 2500 BC. Another expedition took place around 1500 BC during the reign of Queen Hatshepsut.
What are the physical characteristics of the Red Sea regarding temperature and salinity?
The Red Sea is one of the saltiest bodies of water in the world with salinity ranging from 36 parts per thousand to 41 parts per thousand. The average surface water temperature is 28 degrees Celsius in the north and 30 degrees Celsius in the south during summer.
When did the Red Sea form and how is it changing today?
The Red Sea was formed by the Arabian Peninsula being split from the Horn of Africa during the Eocene epoch. In 2005, the sea had grown by 1 centimeter following three weeks of tectonic activity and is still widening.
What environmental threats does the Red Sea face from recent conflicts?
Since November 2023, Houthi forces have conducted over 100 attacks against commercial and naval vessels. The sinking of the MV Rubymar in February 2024 created an 18-mile oil slick resulting from approximately 200 tons of heavy fuel oil and 80 tons of marine diesel oil.
The Red Sea is one of the saltiest bodies of water in the world, owing to high evaporation and low precipitation, with no significant rivers or streams draining into the sea. Its salinity ranges from between 36 parts per thousand in the southern part and 41 parts per thousand in the northern part around the Gulf of Suez, with an average of 40 parts per thousand. The climate of the Red Sea is the result of two monsoon seasons: a northeasterly monsoon and a southwesterly monsoon, which occur because of differential heating between the land and the sea. Very high surface temperatures and high salinity make this one of the warmest and saltiest bodies of seawater in the world, with the average surface water temperature of the Red Sea during the summer being about 28 degrees Celsius in the north and 30 degrees Celsius in the south, with only about 2 degrees Celsius variation during the winter months. The overall average water temperature is 22 degrees Celsius, and temperature and visibility remain good to around 100 meters. The sea is known for its strong winds and unpredictable local currents, with the northern part of the Red Sea dominated by persistent north-west winds, with speeds ranging between 10 and 20 knots. The rest of the Red Sea and the Gulf of Aden are subjected to regular and seasonally reversible winds, with the wind regime characterized by seasonal and regional variations in speed and direction with average speed generally increasing northward. The wind is the driving force in the Red Sea to transport material as suspension or as bedload, and wind-induced currents play an important role in the Red Sea in resuspending bottom sediments and transferring materials from sites of dumping to sites of burial in a quiescent environment of deposition.
Coral Kingdoms
The Red Sea is a rich and diverse ecosystem, with more than 1,200 fish species recorded, of which 10% are endemic, found nowhere else. Since the opening of the Suez Canal in November 1869, over a thousand marine species from the Red Sea, from plankton and seaweeds to invertebrates and fishes, have migrated northward and settled in the Mediterranean Sea, forming a significant component of the Mediterranean ecosystem. The rich diversity of the Red Sea is in part due to the 2,000 kilometers of coral reef extending along its coastline, which are 5,000 to 7,000 years old and are largely formed of stony acropora and porite corals. The reefs form platforms and sometimes lagoons along the coast and occasionally other features such as cylinders, including the Blue Hole at Dahab. The Red Sea also hosts many offshore reefs, including several true atolls, and many of the unusual offshore reef formations defy classic coral reef classification schemes, and are generally attributed to the high levels of tectonic activity that characterize the area. Both offshore and coastal reefs are visited by pelagic species of fish, including many of the 44 recorded species of shark, and by many species, over 175, of nudibranch, many of which are endemic to the Red Sea. The high marine biodiversity of the area is recognized by the Egyptian government, which set up the Ras Mohammed National Park in 1983, one of the world's top 10 sites recognized by the International Union for Conservation of Nature for effective management of marine ecosystems, and the first marine protected area in Africa and in the Middle East region.
Geological Fire and Brine
The Red Sea was formed by the Arabian Peninsula being split from the Horn of Africa by the movement of the Red Sea Rift, which started in the Eocene and accelerated during the Oligocene. The sea is still widening, and in 2005, following a three weeks of tectonic activity, it had grown by 1 centimeter, and it is considered that it will become an ocean in time, as proposed in the model of John Tuzo Wilson. In 1949, a deep water survey reported anomalously hot brines in the central portion of the Red Sea, and later work in the 1960s confirmed the presence of hot, 100 degrees Celsius, saline brines and associated metalliferous muds. The hot solutions were emanating from an active subseafloor rift, and Lake Asal in Djibouti is eligible as an experimental site to study the evolution of the deep hot brines of the Red Sea. Sometime during the Tertiary, the Bab el Mandeb closed and the Red Sea evaporated to an empty hot dry salt-floored sink, with effects causing this including a race between the Red Sea widening and Perim Island erupting filling the Bab el Mandeb with lava, and the lowering of world sea level during the Ice Ages because of much water being locked up in the ice caps. Several volcanic islands rise from the center of the sea, most of which are dormant, but in 2007, Jabal al-Tair island in the Bab el Mandeb strait erupted violently, and two new islands were formed in 2011 and 2013 in the Zubair Archipelago, a small chain of islands owned by Yemen, with the first island, Sholan Island, emerging in an eruption in December 2011, and the second island, Jadid, emerging in September 2013.
Modern Conflicts and Crises
Since November 2023, Houthi forces have conducted over 100 attacks against commercial and naval vessels, transforming the Red Sea into a high-risk zone for environmental disasters. The sinking of the MV Rubymar in February 2024 created an 18-mile oil slick resulting from approximately 200 tons of heavy fuel oil and 80 tons of marine diesel oil, and the vessel was also carrying 21,000 metric tons of fertilizer, raising concerns about large-scale nutrient overloading that could trigger extensive algal blooms, potentially leading to seawater contamination and fish mortality. The August 2024 attacks on the Sounion tanker carrying 150,000 tons of crude oil represented a further threat, with salvage operations repeatedly hindered by Houthi interference before it was safely removed by the EU's Operation Aspides. The attacks on the MV Tutor in June 2024 and on the Chios Lion tanker in July 2024, generating a 136-mile oil slick, illustrate the systematic pattern of environmental damage from sustained maritime conflict to the Red Sea ecosystem. Container vessel traffic through the Suez Canal declined by approximately 75 percent in 2024 compared to 2023, as many shipping companies rerouted vessels around Africa's Cape of Good Hope, adding around 4,575 nautical miles to the sailing distance between Shanghai and Rotterdam, increasing voyage durations on average by 12 days, and leading to an increase in fuel consumption of up to 33 percent, with the resulting environmental impact manifesting as approximately 40 percent increase in CO₂ emissions per voyage. The region is associated with hazardous navigation conditions created by intersecting weather systems, and in 2024, approximately 200 containers were lost along this passage, accounting for around 35 percent of all recorded container losses in that year. Military operations like Prosperity Guardian and Poseidon Archer have deployed naval forces from more than fifteen nations in the Red Sea region, and their military sonar systems can cause behavioral disruptions, habitat displacement, and physiological harm to marine life, with cetacean species in the Red Sea being particularly vulnerable to acoustic disturbances due to their reliance on echolocation and acoustic communication for critical life functions including navigation, foraging, and social bonding.
Trade and Tourism
The Red Sea serves an important role in the global economy, with cargo vessels traveling between the Indian Ocean and the Mediterranean Sea every year, thus shortening the path between Asia and Europe almost by half, as compared to traveling around Africa via the Atlantic Ocean. Twelve percent of global trade passes through the Red Sea, including 30 percent of global container traffic. The sea is known for its recreational diving sites, such as Ras Mohammed, SS Thistlegorm, Elphinstone Reef, The Brothers, Daedalus Reef, St. John's Reef, and Rocky Island in Egypt, and less known sites in Sudan such as Sanganeb, Abington, Angarosh, and Shaab Rumi. The Red Sea became a popular destination for diving after the expeditions of Hans Hass in the 1950s, and later by Jacques-Yves Cousteau, with popular tourist resorts including El Gouna, Hurghada, Safaga, and Marsa Alam on the west shore of the Red Sea, and Sharm-el-Sheikh, Dahab, and Taba on the Egyptian side of Sinai, as well as Aqaba in Jordan and Eilat in Israel in an area known as the Red Sea Riviera. The popular tourist beach of Sharm el-Sheikh was closed to all swimming in December 2010 due to several serious shark attacks, including a fatality, and as of December 2010, scientists are investigating the attacks and have identified, but not verified, several possible causes including overfishing which causes large sharks to hunt closer to shore, tourist boat operators who chum offshore for shark-photo opportunities, and reports of ships throwing dead livestock overboard. The Red Sea Project is building the highest quality accommodation and a wide range of facilities on the coastline in Saudi Arabia, which will allow people to visit the coastline of the Red Sea by the end of 2022 but will be fully finished by 2030. Tourism to the region has been threatened by occasional terrorist attacks, and by incidents related to food safety standards.