Red Sea
The Red Sea began to form during the Eocene epoch, when tectonic forces started splitting the Arabian Peninsula from the Horn of Africa. This geological process accelerated significantly in the Oligocene period and continues today. In 2005, a three-week period of intense tectonic activity caused the sea to widen by an additional distance measurable only through satellite data. Scientists project that this rift will eventually evolve into a full ocean basin, following models proposed by geologist John Tuzo Wilson.
Deep beneath the surface, the central portion holds anomalously hot brines discovered during a 1949 survey. Later work in the 1960s confirmed these waters were saline and associated with metalliferous muds emanating from active subseafloor rifts. The high salinity of these deep waters was initially thought too hostile for living organisms, yet they remain a subject of intense study regarding their evolution. Lake Asal in Djibouti serves as an experimental site to understand how such salt waters formed at the bottom of the Red Sea.
Volcanic activity has shaped the landscape above these depths. Jabal al-Tair island erupted violently in 2007 within the Bab el Mandeb strait. Two new islands emerged later: Sholan Island appeared in December 2011, followed by Jadid in September 2013. These formations belong to the Zubair Archipelago, a small chain owned by Yemen. Most volcanic islands in the region remain dormant, but the constant tectonic movement ensures the sea floor remains dynamic.
The earliest known exploration of this waterway occurred around 2500 BC when ancient Egyptians attempted to establish commercial routes to Punt. A second major expedition took place around 1500 BC under Queen Hatshepsut, involving long voyages down the Red Sea coast. These journeys laid the groundwork for centuries of maritime interaction between Africa and Asia.
In the 6th century BC, Darius the Great of the Achaemenid Empire sent reconnaissance missions to identify navigational hazards like rocks and currents. He commissioned the construction of a canal linking the Nile River to the northern end of the Red Sea at Suez. Inscriptions on stone monuments called stelae documented the completion of this project, which facilitated trade and solidified Persian control over Egypt. This ancient canal served as a predecessor to the modern Suez Canal opened in November 1869.
Greek navigators continued exploring these waters during the late 4th century BC under Alexander the Great. Agatharchides collected detailed information about the sea in the 2nd century BC. The Periplus of the Erythraean Sea, written by an unknown author around the 1st century, described ports and sea routes in detail. Roman trade with India grew significantly starting with the reign of Augustus, utilizing the route to bring goods from China into the Roman world. Contact between Rome and China depended heavily on this passage until the Aksumite Empire broke the route around the 3rd century AD.
More than 1,000 invertebrate species and 200 types of soft and hard coral live within the Red Sea. These fringing reefs are 5000 to 7000 years old and largely formed of stony acropora and porite corals. The extensive shallow shelves support some of the healthiest reef environments in the world due to low human population and minimal development in the region.
Over 1,200 fish species have been recorded here, with 10% being endemic to the area. Hawksbill sea turtles and spinner dolphins frequent these waters alongside many species of nudibranch. Fourteen species of sharks roam the depths, including the great hammerhead and oceanic whitetip shark. A blue whale was seen in the Gulf of Aqaba in 2018, while a false killer whale was discovered off Saudi Arabia in December 2024.
Despite high surface temperatures reaching up to 30 degrees Celsius in summer, coral bleaching remains surprisingly rare. Only 9 percent of the coral is infected by Thalassomonas loyana, known as the white plague agent. Favia favus coral harbors a virus called BA3 that kills this specific pathogen. Scientists investigate these unique properties hoping to salvage bleached coral elsewhere.
Undiscovered oil reserves in the region have been estimated at vast quantities controlled by basin structures and normal faults. The Durwara 2 Field was discovered in 1963 while the Suakin 1 Field appeared in 1976 on the Egyptian side. The Barqan Field emerged in 1969 and the Midyan Field in 1992 within the Saudi Arabian Midyan Basin.
There are at least 18 desalination plants along the Red Sea coast of Saudi Arabia discharging warm brine and treatment chemicals. These effluents bleach and kill corals while causing diseases in fish populations. This localized impact may intensify over time and profoundly affect the fishing industry.
The Suez Canal handles 12 percent of global trade including 30 percent of global container traffic. It shortens the path between Asia and Europe by almost half compared to traveling around Africa via the Atlantic Ocean. Modern development focuses heavily on these fields, with oil seeps occurring near the Farasan Islands and Dahlak Archipelago.
Container vessel traffic through the Suez Canal declined by approximately 75 percent in 2024 compared to 2023 as companies rerouted vessels around Africa's Cape of Good Hope. Ships now travel 50 to 60 percent longer distances adding around 4575 nautical miles to the sailing distance between Shanghai and Rotterdam. This increases voyage durations by an average of 12 days and fuel consumption by up to 33 percent.
The resulting environmental impact manifests as a 40 percent increase in CO2 emissions per voyage. Speed increases potentially amplify emissions by an additional 14 percent. Longer roundtrip schedules imply fleets require at least two additional ships to ensure weekly service, leading to a 67 percent increase in total fleet emissions for typical Asia-North Europe services operating weekly.
In 2024, approximately 200 containers were lost along the Cape route accounting for 35 percent of all recorded container losses that year. Military sonar systems deployed by naval forces cause behavioral disruptions and habitat displacement to marine life. Cetacean species are particularly vulnerable due to their reliance on echolocation for navigation and social bonding.
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Common questions
When did the Red Sea begin to form?
The Red Sea began to form during the Eocene epoch when tectonic forces started splitting the Arabian Peninsula from the Horn of Africa. This geological process accelerated significantly in the Oligocene period and continues today.
What volcanic islands emerged in the Red Sea between 2011 and 2013?
Sholan Island appeared in December 2011 followed by Jadid in September 2013 within the Zubair Archipelago owned by Yemen. Jabal al-Tair island erupted violently in 2007 within the Bab el Mandeb strait before these new formations occurred.
Who commissioned the first canal linking the Nile River to the Red Sea at Suez?
Darius the Great of the Achaemenid Empire sent reconnaissance missions and commissioned the construction of a canal linking the Nile River to the northern end of the Red Sea at Suez in the 6th century BC. Inscriptions on stone monuments called stelae documented the completion of this project which facilitated trade and solidified Persian control over Egypt.
How many fish species live in the Red Sea and what percentage are endemic?
Over 1,200 fish species have been recorded here with 10% being endemic to the area. Hawksbill sea turtles and spinner dolphins frequent these waters alongside many species of nudibranch while fourteen species of sharks roam the depths including the great hammerhead and oceanic whitetip shark.
What happened to shipping volumes in the Red Sea during January 2024?
In January 2024 Red Sea shipping volumes dropped to 30 percent of normal levels due to Houthi attacks against commercial and naval vessels near the Bab al-Mandeb strait. One ship was hijacked and taken back to Yemen during the Gaza war causing significant disruption to maritime traffic.
When did the modern Suez Canal open and how much global container traffic does it handle today?
The modern Suez Canal opened in November 1869 as a successor to an ancient canal commissioned by Darius the Great. The Suez Canal handles 12 percent of global trade including 30 percent of global container traffic while shortening the path between Asia and Europe by almost half compared to traveling around Africa via the Atlantic Ocean.