|Strait of Gibraltar|
The Strait of Gibraltar as seen from space.
The Iberian Peninsula is on the left and North Africa on the right.
|Location||Atlantic Ocean – Mediterranean Sea|
|Native name||مضيق جبل طارق (Arabic)|
Estrecho de Gibraltar (Spanish)
|Min. width||14.3 km (8.9 mi)|
|Max. depth||900 metres (2,953 ft)|
The Strait of Gibraltar (Arabic : مضيق جبل طارق, romanized: Maḍīq Jabal Ṭāriq; Spanish : Estrecho de Gibraltar) is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Gibraltar and Peninsular Spain in Europe from Morocco and Ceuta (Spain) in Africa.
The romanization of Arabic writes written and spoken Arabic in the Latin script in one of various systematic ways. Romanized Arabic is used for a number of different purposes, among them transcription of names and titles, cataloging Arabic language works, language education when used in lieu of or alongside the Arabic script, and representation of the language in scientific publications by linguists. These formal systems, which often make use of diacritics and non-standard Latin characters and are used in academic settings or for the benefit of non-speakers, contrast with informal means of written communication used by speakers such as the Latin-based Arabic chat alphabet.
Spanish, known in the Middle Ages as Castilian, is a Romance language that originated in the Castile region of Spain and today has hundreds of millions of native speakers in the Americas and Spain. It is a global language and the world's second-most spoken native language, after Mandarin Chinese.
A strait is a naturally formed, narrow, typically navigable waterway that connects two larger bodies of water. Most commonly it is a channel of water that lies between two land masses. Some straits are not navigable, for example because they are too shallow, or because of an unnavigable reef or archipelago.
The two continents are separated by 14.3 kilometres (8.9 mile s; 7.7 nautical mile s) of ocean at the Strait's narrowest point. The Strait's depth ranges between 300 and 900 metres (980 and 2,950 feet ; 160 and 490 fathom s) which possibly interacted with the lower mean sea level of the last major glaciation 20,000 years ago when the level of the sea is believed to have been lower by 110–120 m (360–390 ft; 60–66 fathoms). Ferries cross between the two continents every day in as little as 35 minutes. The Spanish side of the Strait is protected under El Estrecho Natural Park.
The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.
A nautical mile is a unit of measurement used in both air and marine navigation, and for the definition of territorial waters. Historically, it was defined as one minute of latitude. Today the international nautical mile is defined as exactly 1852 metres. This converts to about 1.15 imperial/US miles. The derived unit of speed is the knot, one nautical mile per hour.
The foot is a unit of length in the imperial and US customary systems of measurement. Since the International Yard and Pound Agreement of 1959, one foot is defined as 0.3048 meter exactly. In customary units, the foot comprises 12 inches and three feet compose a yard.
The name comes from the Rock of Gibraltar, which in turn originates from the Arabic Jabal Ṭāriq (meaning "Tariq's Mount"), Arabic: باب المغرب), "Gate of Morocco". In the Middle Ages, Muslims called it Az-Zuqāq (الزقاق), "the Passage", the Romans called it Fretum Gatitanum (Strait of Cadiz), and in the ancient world it was known as the "Pillars of Hercules" (Ancient Greek : αἱ Ἡράκλειοι στῆλαι, romanized: hai Hērákleioi stêlai).named after Tariq ibn Ziyad. It is also known as the Straits of Gibraltar, the Gut of Gibraltar (although this is mostly archaic), the STROG (STRait Of Gibraltar) in naval use, and Bāb al-Maghrib (
The Rock of Gibraltar, also known as the Rock, is a monolithic limestone promontory located in the British overseas territory of Gibraltar, near the southwestern tip of Europe on the Iberian Peninsula. It is 426 m (1,398 ft) high. Most of the Rock's upper area is covered by a nature reserve, which is home to around 300 Barbary macaques. These macaques, as well as a labyrinthine network of tunnels, attract a large number of tourists each year.
Ṭāriq ibn Ziyād was a Umayyad commander who led the Muslim conquest of Visigothic Hispania in 711–718 A.D. Under the orders of the Umayyad Caliph Al-Walid I he led a large army and crossed the Strait of Gibraltar from the North African coast, consolidating his troops at what is today known as the Rock of Gibraltar. The name "Gibraltar" is the Spanish derivation of the Arabic name Jabal Ṭāriq, meaning "mountain of Ṭāriq", which is named after him.
A gut is a narrow coastal body of water, a channel or strait, usually one that is subject to strong tidal currents flowing back and forth. A gut may also be a small creek.
On the northern side of the Strait are Spain and Gibraltar (a British overseas territory in the Iberian Peninsula), while on the southern side are Morocco and Ceuta (a Spanish exclave in Morocco). Its boundaries were known in antiquity as the Pillars of Hercules.
Spain, officially the Kingdom of Spain, is a country mostly located in Europe. Its continental European territory is situated on the Iberian Peninsula. Its territory also includes two archipelagoes: the Canary Islands off the coast of Africa, and the Balearic Islands in the Mediterranean Sea. The African enclaves of Ceuta, Melilla, and Peñón de Vélez de la Gomera make Spain the only European country to have a physical border with an African country (Morocco). Several small islands in the Alboran Sea are also part of Spanish territory. The country's mainland is bordered to the south and east by the Mediterranean Sea except for a small land boundary with Gibraltar; to the north and northeast by France, Andorra, and the Bay of Biscay; and to the west and northwest by Portugal and the Atlantic Ocean.
Gibraltar is a British Overseas Territory located at the southern tip of the Iberian Peninsula. It has an area of 6.7 km2 (2.6 sq mi) and is bordered to the north by Spain. The landscape is dominated by the Rock of Gibraltar at the foot of which is a densely populated town area, home to over 30,000 people, primarily Gibraltarians.
The Iberian Peninsula, also known as Iberia, is located in the southwest corner of Europe. The peninsula is principally divided between Spain and Portugal, comprising most of their territory. It also includes Andorra, small areas of France, and the British overseas territory of Gibraltar. With an area of approximately 596,740 square kilometres (230,400 sq mi)), it is both the second largest European peninsula by area, after the Scandinavian Peninsula, and by population, after the Balkan Peninsula.
Due to its location, the Strait is commonly used for illegal immigration from Africa to Europe.
Illegal immigration refers to the migration of people into a country in violation of the immigration laws of that country, or the continued residence of people without the legal right to live in that country. Illegal immigration tends to be financially upward, from poorer to richer countries. Illegal residence in another country creates the risk of being detained and deported, or facing other sanctions.
The International Hydrographic Organization defines the limits of the Strait of Gibraltar as follows:
The International Hydrographic Organization (IHO) is an inter-governmental organisation representing hydrography.
The seabed of the Strait is composed of synorogenic Betic-Rif clayey flysch covered by Pliocene and/or Quaternary calcareous sediments, sourced from thriving cold water coral communities.Exposed bedrock surfaces, coarse sediments and local sand dunes attest to the strong bottom current conditions at the present time.
Around 5.9 million years ago,the connection between the Mediterranean Sea and the Atlantic Ocean along the Betic and Rifan Corridor was progressively restricted until its total closure, effectively causing the salinity of the Mediterranean to rise periodically within the gypsum and salt deposition range, during what is known as the Messinian salinity crisis. In this water chemistry environment, dissolved mineral concentrations, temperature and stilled water currents combined and occurred regularly to precipitate many mineral salts in layers on the seabed. The resultant accumulation of various huge salt and mineral deposits about the Mediterranean basin are directly linked to this era. It is believed that this process took a short time, by geological standards, lasting between 500,000 and 600,000 years.
It is estimated that, were the Strait closed even at today's higher sea level, most water in the Mediterranean basin would evaporate within only a thousand years, as it is believed to have done then,and such an event would lay down mineral deposits like the salt deposits now found under the sea floor all over the Mediterranean.
After a lengthy period of restricted intermittent or no water exchange between the Atlantic Ocean and Mediterranean basin, approximately 5.33 million years ago, 900 m (3,000 ft; 490 fathoms) at the narrows, 280 m (920 ft; 150 fathoms) at the Camarinal Sill). The Strait is expected to close again as the African Plate moves northward relative to the Eurasian Plate,[ citation needed ] but on geological rather than human timescales.the Atlantic-Mediterranean connection was completely reestablished through the Strait of Gibraltar by the Zanclean flood, and has remained open ever since. The erosion produced by the incoming waters seems to be the main cause for the present depth of the Strait (
The Strait has been identified as an Important Bird Area by BirdLife International because of the hundreds of thousands of seabirds which use it every year to migrate between the Mediterranean and the Atlantic, including significant numbers of Scopoli's and Balearic shearwaters, Audouin's and lesser black-backed gulls, razorbills, and Atlantic puffins.
A resident killer whale pod of some 36 individuals lives around the Strait, one of the few that are left in Western European waters. The pod may be facing extinction in the coming decades due to long term effects of PCB pollution.
Evidence of the first human habitation of the area by Neanderthals dates back to 125,000 years ago. It is believed that the Rock of Gibraltar may have been one of the last outposts of Neanderthal habitation in the world, with evidence of their presence there dating to as recently as 24,000 years ago. 40,000 years.Archaeological evidence of Homo sapiens habitation of the area dates back c.
The relatively short distance between the two shores has served as a quick crossing point for various groups and civilizations throughout history, including Carthaginians campaigning against Rome, Romans travelling between the provinces of Hispania and Mauritania, Vandals raiding south from Germania through Western Rome and into North Africa in the 5th century, Moors and Berbers in the 8th–11th centuries, and Spain and Portugal in the 16th century.
Beginning in 1492, the Strait began to play a certain cultural role in acting as a barrier against cross-channel conquest and the flow of culture and language that would naturally follow such a conquest. In that year, the last Muslim government north of the Strait was overthrown by a Spanish force. Since that time, the Strait has come to foster the development of two very distinct and varied cultures on either side of it after sharing much the same culture and greater degrees of tolerance for over 300 years from the 8th century to the early 13th century.[ citation needed ]
On the northern side, Christian-European culture has remained dominant since the expulsion of the last Muslim kingdom in 1492, along with the Romance Spanish language, while on the southern side, Muslim-Arabic/Mediterranean has been dominant since the spread of Islam into North Africa in the 700s, along with the Arabic language. For the last 500 years, religious and cultural intolerance, more than the small travel barrier that the Strait presents, has come to act as a powerful enforcing agent of the cultural separation that exists between these two groups.[ citation needed ]
The small British enclave of the city of Gibraltar presents a third cultural group found in the Strait. This enclave was first established in 1704 and has since been used by Britain to act as a surety for control of the sea lanes into and out of the Mediterranean.
Following the Spanish coup of July 1936 the Spanish Republican Navy tried to blockade the Strait of Gibraltar to hamper the transport of Army of Africa troops from Spanish Morocco to Peninsular Spain. On 5 August 1936 the so-called Convoy de la victoria was able to bring at least 2,500 men across the Strait, breaking the republican blockade.
The Strait is an important shipping route from the Mediterranean to the Atlantic. There are ferries that operate between Spain and Morocco across the Strait, as well as between Spain and Ceuta and Gibraltar to Tangier.
In December 2003, Spain and Morocco agreed to explore the construction of an undersea rail tunnel to connect their rail systems across the Strait. The gauge of the rail would be 1,435 mm (4 ft 8.5 in) to match the proposed construction and conversion of significant parts of the existing broad gauge system to standard gauge. While the project remains in a planning phase, Spanish and Moroccan officials have met to discuss it as recently as 2012, and proposals predict it could be completed by 2025.
The Strait of Gibraltar links the Atlantic Ocean directly to the Mediterranean Sea. This direct linkage creates certain unique flow and wave patterns. These unique patterns are created due to the interaction of various regional and global evaporative forces, tidal forces, and wind forces.
Through the Strait, water generally flows more or less continually in both an eastward and a westward direction. A smaller amount of deeper saltier and therefore denser waters continually work their way westwards (the Mediterranean outflow), while a larger amount of surface waters with lower salinity and density continually work their way eastwards (the Mediterranean inflow). These general flow tendencies may be occasionally interrupted for brief periods by temporary tidal flows, depending on various lunar and solar alignments. Still, on the whole and over time, the balance of the water flow is eastwards, due to an evaporation rate within the Mediterranean basin higher than the combined inflow of all the rivers that empty into it.[ citation needed ] At the Strait's far western end is the Camarinal Sill, the Strait's shallowest point which limits mixing between the cold, less saline Atlantic water and the warm Mediterranean waters.
The Mediterranean waters are so much saltier than the Atlantic waters that they sink below the constantly incoming water and form a highly saline ( thermohaline , both warm and salty) layer of bottom water. This layer of bottom-water constantly works its way out into the Atlantic as the Mediterranean outflow. On the Atlantic side of the Strait, a density boundary separates the Mediterranean outflow waters from the rest at about 100 m (330 ft; 55 fathoms) depth. These waters flow out and down the continental slope, losing salinity, until they begin to mix and equilibrate more rapidly, much further out at a depth of about 1,000 m (3,300 ft; 550 fathoms). The Mediterranean outflow water layer can be traced for thousands of kilometres west of the Strait, before completely losing its identity.
During the Second World War, German U-boats used the currents to pass into the Mediterranean Sea without detection, by maintaining silence with engines off.From September 1941 to May 1944 Germany managed to send 62 U-boats into the Mediterranean. All these boats had to navigate the British-controlled Strait of Gibraltar where nine U-boats were sunk while attempting passage and 10 more had to break off their run due to damage. No U-boats ever made it back into the Atlantic and all were either sunk in battle or scuttled by their own crews.
Internal waves (waves at the density boundary layer) are often produced by the Strait. Like traffic merging on a highway, the water flow is constricted in both directions because it must pass over the Camarinal Sill. When large tidal flows enter the Strait and the high tide relaxes, internal waves are generated at the Camarinal Sill and proceed eastwards. Even though the waves may occur down to great depths, occasionally the waves are almost imperceptible at the surface, at other times they can be seen clearly in satellite imagery. These internal waves continue to flow eastward and to refract around coastal features. They can sometimes be traced for as much as 100 km (62 mi; 54 nmi), and sometimes create interference patterns with refracted waves.
Except for its far eastern end, the Strait lies within the territorial waters of Spain and Morocco. The United Kingdom claims 5.6 km (3.5 mi; 3.0 nmi) around Gibraltar on the northern side of the Strait, putting part of it inside British territorial waters. As this is less than the 22.2 km (13.8 mi; 12.0 nmi) maximum, it means, according to the British claim, that part of the Strait lies in international waters. The ownership of Gibraltar and its territorial waters is disputed by Spain. Similarly, Morocco disputes Spanish sovereignty over Ceuta on the southern coast. There are several islets, such as the disputed Isla Perejil, that are claimed by both Morocco and Spain.
Under the United Nations Convention on the Law of the Sea, vessels passing through the strait do so under the regime of transit passage, rather than the more limited innocent passage allowed in most territorial waters.
Some studies have proposed the possibility of erecting tidal power generating stations within the Strait, to be powered from the predictable current at the Strait.
In the 1920s and 1930s, the Atlantropa project proposed damming the Strait to generate large amounts of electricity and lower the sea level of the Mediterranean by several hundreds of meters to create large new lands for settlement.This proposal would however have devastating effects on the local climate and ecology and would dramatically change the strength of the West African Monsoon.
The Atlantic Ocean is the second largest of the world's oceans, with an area of about 106,460,000 square kilometers. It covers approximately 20 percent of the Earth's surface and about 29 percent of its water surface area. It separates the "Old World" from the "New World".
Ceuta is an 18.5 km2 Spanish autonomous city on the north coast of Africa, separated by 14 km (9 mi) from Cadiz province on the Spanish mainland by the Strait of Gibraltar and sharing a 6.4 km (4 mi) land border with M'diq-Fnideq Prefecture in the Kingdom of Morocco. It lies along the boundary between the Mediterranean Sea and the Atlantic Ocean and is one of nine populated Spanish territories in Africa and, along with Melilla, one of two populated territories on mainland Africa. It was part of Cádiz province until 14 March 1995 when both Ceuta and Melilla's Statutes of Autonomy were passed, the latter having been part of Málaga province.
The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa and on the east by the Levant. Although the sea is sometimes considered a part of the Atlantic Ocean, it is usually identified as a separate body of water. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was partly or completely desiccated over a period of some 600,000 years, the Messinian salinity crisis, before being refilled by the Zanclean flood about 5.3 million years ago.
Morocco spans from the Mediterranean Sea and Atlantic Ocean on the north and the west respectively, into large mountainous areas in the interior body, to the Sahara desert in the far south. Morocco is a Northern African country, located in the extreme north west of Africa on the edge of continental Europe. The strait of Gibraltar separates Spain off Morocco with a 13 kilometres (8.1 mi) span of water. Morocco borders the North Atlantic Ocean to the west, and the west Mediterranean Sea to the north.
North Atlantic Deep Water (NADW) is a deep water mass formed in the North Atlantic Ocean. Thermohaline circulation of the world's oceans involves the flow of warm surface waters from the southern hemisphere into the North Atlantic. Water flowing northward becomes modified through evaporation and mixing with other water masses, leading to increased salinity. When this water reaches the North Atlantic it cools and sinks through convection, due to its decreased temperature and increased salinity resulting in increased density. NADW is the outflow of this thick deep layer, which can be detected by its high salinity, high oxygen content, nutrient minima, high 14C/12C, and chlorofluorocarbons (CFCs).
Spain is a country located in southwestern Europe occupying most of the Iberian Peninsula and includes a small exclave inside France called Llívia as well as the Balearic Islands in the Mediterranean, the Canary Islands in the Atlantic Ocean 108 km (67 mi) off northwest Africa, and five places of sovereignty on and off the coast of North Africa: Ceuta, Melilla, Islas Chafarinas, Peñón de Alhucemas, and Peñón de Vélez de la Gomera.
Physical oceanography is the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of ocean waters.
Jebel Musa is a mountain in the northernmost part of Morocco, on the African side of the Strait of Gibraltar. It is part of the Rif mountain chain. The mountain is generally identified as the southern Pillar of Hercules, Abila Mons.
The Alboran Sea from Arabic is the westernmost portion of the Mediterranean Sea, lying between the Iberian Peninsula and the north of Africa. The Strait of Gibraltar, which lies at the west end of the Alboran Sea, connects the Mediterranean with the Atlantic Ocean.
The Messinian Salinity Crisis (MSC), also referred to as the Messinian Event, and in its latest stage as the Lago Mare event, was a geological event during which the Mediterranean Sea went into a cycle of partly or nearly complete desiccation throughout the latter part of the Messinian age of the Miocene epoch, from 5.96 to 5.33 Ma. It ended with the Zanclean flood, when the Atlantic reclaimed the basin.
The Strait of Gibraltar crossing is a hypothetical bridge or tunnel spanning the Strait of Gibraltar that would connect Europe and Africa. The governments of Spain and Morocco appointed a joint committee to investigate the feasibility of linking the two continents in 1979, which resulted in the much broader Euromed Transport project.
El Estrecho Natural Park is a natural park in Spain, located on the northern side of the Strait of Gibraltar.
The Camarinal Sill is the sill separating the Mediterranean Sea and the Atlantic Ocean. This threshold is the shallowest seafloor pass between the Iberian Peninsula and Africa. It is located near the Strait of Gibraltar and the Espartel Sill, at, at an elevation of −280 m.
Atlantropa, also referred to as Panropa, was a gigantic engineering and colonisation idea devised by the German architect Herman Sörgel in the 1920s and promoted by him until his death in 1952. Its central feature was a hydroelectric dam to be built across the Strait of Gibraltar, which would have provided enormous amounts of hydroelectricity and would have led to the lowering of the surface of the Mediterranean Sea by up to 200 metres (660 ft), opening up large new lands for settlement, for example in the Adriatic Sea. The project proposed four additional major dams as well:
In recent times, Morocco–Spain relations have been friendly though intermittently discordant.
The Mirador del Estrecho is a scenic overlook over the Strait of Gibraltar located within the municipal borders of Tarifa, Spain, 6 kilometres (3.7 mi) from its urban centre. The overlook is 300 metres (980 ft) above sea level and can be reached via the N-340 road.
The Tingitana Peninsula, also known as the Tangier Peninsula, is a small peninsula in northwest Africa, which together with the Iberian Peninsula, southernmost part of mainland Spain, forms the Strait of Gibraltar, the Atlantic Ocean boundary with the Mediterranean Sea. The principal cities are Tangier, Tétouan and Ceuta. Administratively, the peninsula belongs to the Moroccan prefectures of Tangier-Asilah Morocco, Fahs Anjra, M'Diq-Fnideq and Tetuan, and the Spanish autonomous city of Ceuta. Historically it belonged to the province of Mauritania Tingitana.
Orlando Fernández, a.k.a. "The Puerto Rican Aquaman", is the first Puerto Rican swimmer to cross the Strait of Gibraltar.
The Zanclean flood or Zanclean deluge is a flood theorized to have refilled the Mediterranean Sea 5.33 million years ago. This flooding ended the Messinian salinity crisis and reconnected the Mediterranean Sea to the Atlantic Ocean, although it is possible that even before the flood there were partial connections to the Atlantic Ocean. The reconnection marks the beginning of the Zanclean age.
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