The Argentine Sea ( es, Mar Argentino) is a marginal sea of the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

adjacent to the southern tip of

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sou ...

. It ranges from the mouth of the estuary of the Río de la Plata in the north (

35th parallel south The 35th parallel south is a circle of latitude that is 35 degrees south of the Earth's equatorial plane. It crosses the Atlantic Ocean, the Indian Ocean, Australasia, the Pacific Ocean and South America. At this latitude the sun is vis ...

) to the Isla de los Estados in the south, and from the Argentine coast to the 200 meters isobath. Its width varies between 210 km in front of

Mar del Plata Mar del Plata is a city on the coast of the Atlantic Ocean, in Buenos Aires Province, Argentina. It is the seat of General Pueyrredón district. Mar del Plata is the second largest city in Buenos Aires Province. The name "Mar del Plata" is a sh ...

and 850 km at the latitude of the

Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouze ...

. The coastline extends for 4,725 km. To the east of the Argentine Sea extends much deeper and more extensive Argentine Basin.

Geography

The Argentine Sea is in the South Atlantic Ocean off the southeastern coast of Argentina, extending from the approximate latitude of

Montevideo Montevideo () is the capital and largest city of Uruguay. According to the 2011 census, the city proper has a population of 1,319,108 (about one-third of the country's total population) in an area of . Montevideo is situated on the southern co ...

, Uruguay, southward to

Tierra del Fuego Tierra del Fuego (, ; Spanish for "Land of the Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla ...

, and is situated about north of

Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest cont ...

. The Argentine Sea has a surface area of and is one of the largest seas in the world. The average depth of the sea is and the maximum depth is . It has a salinity of 3.5%. The Argentine Sea progressively widens going southward, in contrast to the narrowing of the continental mass. The sea platform has a series of plateaux which descend to the east as large terraces or steps. Because of its stair-shaped plateaux, the Argentine Sea is similar morphologically to the Extra- Andean

Patagonia Patagonia () refers to a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and g ...

. The

are also located within the continental shelf of the Argentine Sea.

Territorial claims

According to the law 23968, the

territorial waters The term territorial waters is sometimes used informally to refer to any area of water over which a sovereign state has jurisdiction, including internal waters, the territorial sea, the contiguous zone, the exclusive economic zone, and potent ...

of Argentina extend from the line from the gulfs of San Matías and San Jorge to the outer limits of the River Plate. The contiguous zone extends 12 nautical miles after the territorial waters, and the exclusive economic zone from it. The continental shelf extends to either the limits of the exclusive economic zone or the shelf slope. Argentina has signed and ratified the

United Nations Convention on the Law of the Sea The United Nations Convention on the Law of the Sea (UNCLOS), also called the Law of the Sea Convention or the Law of the Sea Treaty, is an international agreement that establishes a legal framework for all marine and maritime activities. , 167 ...

. The exclusive economic zone claimed by Argentina overlap with claims maintained by the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and ...

around the

and similar claims around

South Georgia and the South Sandwich Islands ) , anthem = " God Save the King" , song_type = , song = , image_map = South Georgia and the South Sandwich Islands in United Kingdom.svg , map_caption = Location of South Georgia and the South Sandwich Islands in the southern Atlantic Oc ...

. The UK's Falkland Islands claim boundary starts from the midpoint between Argentina and the Islands to the West and stretches 200 nautical miles in other directions with similar claims around the other

British Overseas Territories The British Overseas Territories (BOTs), also known as the United Kingdom Overseas Territories (UKOTs), are fourteen territories with a constitutional and historical link with the United Kingdom. They are the last remnants of the former Bri ...

. Argentina announced its claim without consultation with the United Kingdom. In the years 1990 to 2005 fishing and mineral resources in the area were administered by joint commissions between Argentina and the United Kingdom, Argentina unilaterally withdrew from these organisations in 2005 to pursue a more aggressive stance in its claim to the Falkland Islands. At any one time Argentina usually has a single vessel patrolling the undisputed area of its claim, the vessels do not enter the exclusive economic zone of the United Kingdom although there have been reports of Argentine warships threatening vessels on the Falkland side of the border by radio. Under the terms of the

Article 59 disputed and overlapping claims have no legal force until the dispute is resolved between the opposing parties.

Biodiversity

The Argentine sea is one of the most temperate seas of the world. It receives the cold Falkland Current from the south, which comes from the Antarctic, and the warm

Brazil Current The Brazil Current is a warm water current that flows south along the Brazilian south coast to the mouth of the Río de la Plata. Description This current is caused by diversion of a portion of the Atlantic South Equatorial Current from wher ...

from the north. The Argentine sea has twelve areas identified as places of great biodiversity. There are two international protected areas, one national, and eighteen provincial ones. The Argentine sea has

plankton Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a cruc ...

algae Algae (; singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular micr ...

crustacean Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapoda, decapods, ostracoda, seed shrimp, branchiopoda, branchiopods, argulidae, fish lice, krill, remipedes, isopoda, isopods, barnacles, copepods, ...

s, sardines and anchovies. Those feed the more advanced fauna such as penguins,

cormorant Phalacrocoracidae is a family of approximately 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the IOC adopted a consensus taxonomy of seven ge ...

s, sharks, whales, dolphins,

Burmeister's porpoise Burmeister's porpoise (''Phocoena spinipinnis'') is a species of porpoise endemic to the coast of South America. It was first described by Hermann Burmeister, for whom the species is named, in 1865. Locally it is known as ''marsopa espinosa'' ( ...

, fur seals, sea lions, and southern elephant seals.

References

{{Marginal seas of the Atlantic Ocean Bodies of water of Argentina Seas of the Atlantic Ocean

Geography

Territorial claims

Biodiversity

See also

References