Straits of the Mediterranean Sea

Straits of the Mediterranean Sea
Name	Mediterranean Sea straits
Location	Mediterranean Sea
Type	Straits
Countries	Spain, France, Monaco, Italy, Malta, Tunisia, Algeria, Morocco, Libya, Greece, Turkey, Cyprus, Syria, Lebanon, Israel, Egypt, Palestine
Length	variable
Width	variable

Contents

Straits of the Mediterranean Sea The straits of the Mediterranean Sea are narrow maritime passages that connect basins within the Mediterranean and link the Mediterranean to the Atlantic Ocean, the Red Sea, and inland seas around Europe, Africa, and Asia. These passages—ranging from the wide Sicily Channel to the narrow Dardanelles and Bosporus—have shaped navigation routes used by Phoenicians, Greeks, Romans, Byzantines, Ottoman Empire, Spanish Empire, British Empire, and modern states including Italy, Spain, France, Greece, and Turkey. The straits influence regional climate, marine currents, and biogeographic exchange between basins that involve actors such as European Union, NATO, United Nations, International Maritime Organization, and national navies.

Geography and physical characteristics

Straits in the Mediterranean Sea vary in width, depth, and bathymetry, with examples including the shallow sill of the Sicilian Channel and the deep, constricted Gibraltar Strait near Gibraltar. Major seabed features connect to the Alboran Sea, Tyrrhenian Sea, Ionian Sea, Aegean Sea, Adriatic Sea, Levantine Sea, and Balearic Sea, affecting inflow and outflow across sills such as the Siculo-Tunisian Strait. Tidal ranges are generally low but local currents near Strait of Messina, Cabo de Gata, and the Gulf of Antalya can be strong, interacting with wind systems influenced by Mistral, Sirocco, Bora, and Etesian winds. Hydrographic fronts influence exchanges of salinity and temperature between the Atlantic Ocean through the Strait of Gibraltar and the eastern Mediterranean, with impacts observed in studies by institutions like National Oceanic and Atmospheric Administration, European Space Agency, Mediterranean Science Commission, and regional universities such as University of Barcelona, University of Athens, Bogazici University.

Western Mediterranean: notable passages include the Strait of Gibraltar between Spain and Morocco, the Alboran Sea outlets, the Sicilian Channel separating Sicily and Tunisia, and the Strait of Bonifacio between Corsica and Sardinia adjacent to France and Italy. Central Mediterranean: includes the Strait of Messina between Sicily and Calabria (Italy), the Siculo-Tunisian Strait near Pantelleria, and the Otranto Strait linking the Adriatic Sea to the Ionian Sea between Italy and Albania. Eastern Mediterranean: contains the Dardanelles and Bosporus connecting the Aegean Sea to the Sea of Marmara and on to the Black Sea adjacent to Turkey, the Strait of Sicily influences circulation toward Malta and Gozo, while the Strait of Cyprus and passages around Rhodes affect links to the Levantine Basin near Israel, Lebanon, Syria, and Egypt. Peripheral narrow channels include the Gulf of Gabes approaches near Tunisia and the Aegean archipelago channels among Lesbos, Chios, Samos, Crete, and Rhodes.

Formation of Mediterranean straits is tied to tectonics of the African Plate, Eurasian Plate, Anatolian Plate, and microplates such as the Aegean Plate and Adriatic Plate, and to Messinian events including the Messinian salinity crisis. The opening of the Strait of Gibraltar in the Pliocene and the complex uplift and subsidence that created the Dardanelles and Bosporus are recorded in stratigraphy studied by teams from institutions including Institut de Physique du Globe de Paris, CNR (Italy), National Observatory of Athens, and Turkish Petroleum Corporation. Oceanographic exchanges feature the inflow of relatively low-salinity Atlantic surface waters and the outflow of higher-salinity Mediterranean deep waters, producing the Mediterranean Outflow Water that enters the Atlantic Ocean near Gibraltar and feeds large-scale circulation examined by Scripps Institution of Oceanography, Plymouth Marine Laboratory, and Barcelona Supercomputing Center.

Straits in the Mediterranean are chokepoints for global shipping, energy transit, and naval operations. The Strait of Gibraltar handles commercial traffic for ports like Algeciras, Gibraltar, Tangier, and influences routes to Port of Valencia, Port of Marseille-Fos, Port of Genoa, Port of Piraeus, Port of Haifa, and Port of Alexandria. Passage rights are shaped by treaties and regimes such as Treaty of Lausanne and precedents involving Montreux Convention Regarding the Regime of the Straits, affecting naval transit for countries including Russia, United States, United Kingdom, Italy, France, Spain, and regional actors like Egypt and Turkey. Energy corridors for liquefied natural gas and crude oil transit to terminals at Fos-sur-Mer, Sines, Taranto, Damietta, and Ceyhan rely on secure strait access, while fisheries, tourism industries in Côte d'Azur, Amalfi Coast, Balearic Islands, and Turkish Riviera depend on navigable channels.

Control of Mediterranean straits has influenced empires and conflicts from Phoenician colonization and Peloponnesian War through Punic Wars, Battle of Actium, Fourth Crusade, the Ottoman–Habsburg wars, Napoleonic Wars, Crimean War, World War I, and World War II. Strategic operations at chokepoints involved actors such as Hannibal, Alexander the Great, Julius Caesar, Constantine the Great, Suleiman the Magnificent, Admiral Nelson, Winston Churchill, and institutions like the Royal Navy, Regia Marina, US Navy, and Soviet Navy. Diplomatic settlements and conflicts—e.g., Treaty of Lausanne, Congress of Vienna outcomes, and 20th-century mandates involving League of Nations and United Nations—shifted control and legal regimes over straits and adjacent territories including Cyprus dispute locations and Suez Crisis repercussions impacting eastern approaches.

Narrow straits act as conduits for species invasions, including Lessepsian migrants via the Suez Canal such as Lagocephalus sceleratus (silver-cheeked toadfish), affecting fisheries managed under authorities like General Fisheries Commission for the Mediterranean and programs by BirdLife International for migratory seabirds. Pollution sources from tanker routes, urban ports like Marseille, Barcelona, Alexandria, and industrial zones near Tunis contribute to eutrophication, hypoxia, and microplastic accumulation monitored by World Wildlife Fund, International Union for Conservation of Nature, and regional agencies. Climate change drives warming and salinity shifts that affect endemic taxa in the Adriatic Sea, Aegean Sea, and Levantine Sea, while marine protected areas around Pelagos Sanctuary, El Estrecho Natural Park, Banc d'Arguin and proposed networks aim to conserve cetaceans like Cuvier's beaked whale and Mediterranean monk seal populations supported by research from IUCN, WWF, MedPAN, University of Barcelona, and Hellenic Centre for Marine Research.

Category:Straits