An ocean bank, sometimes referred to as a fishing bank or simply bank, is a part of the

seabed The seabed (also known as the seafloor, sea floor, ocean floor, and ocean bottom) is the bottom of the ocean. All floors of the ocean are known as 'seabeds'. The structure of the seabed of the global ocean is governed by plate tectonics. Most of ...

that is shallow compared to its surrounding area, such as a

shoal In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material and rises from the bed of a body of water to near the surface. It ...

or the top of an underwater hill. Somewhat like continental slopes, ocean bank slopes can

upwell __NOTOC__ Upwell is a village and civil parish in the English county of Norfolk. Upwell village is on the A1101 road, as is Outwell, its conjoined village at the north. The nearest towns are Wisbech to the north-west and Downham Market to the ...

tidal Tidal is the adjectival form of tide. Tidal may also refer to: * ''Tidal'' (album), a 1996 album by Fiona Apple * Tidal (king), a king involved in the Battle of the Vale of Siddim * TidalCycles, a live coding environment for music * Tidal (servic ...

and other flows intercept them, sometimes resulting in nutrient-rich currents. Because of this, some large banks, such as

Dogger Bank Dogger Bank (Dutch: ''Doggersbank'', German: ''Doggerbank'', Danish: ''Doggerbanke'') is a large sandbank in a shallow area of the North Sea about off the east coast of England. During the last ice age the bank was part of a large landmass c ...

and the

Grand Banks of Newfoundland The Grand Banks of Newfoundland are a series of underwater plateaus south-east of the island of Newfoundland on the North American continental shelf. The Grand Banks are one of the world's richest fishing grounds, supporting Atlantic cod, swordf ...

, are among the richest fishing grounds in the world. There are some banks that were reported in the 19th century by navigators, such as

Wachusett Reef Wachusett Reef was a phantom reef in the Antarctic Ocean. Captain Lambert of the ship ''Wachusett'' reported that on June 4, 1899 he passed over a reef which appeared to be of coral formation in approximately latitude . The reef appeared to be ...

, whose existence is doubtful.

Types

Ocean banks may be of

volcanic A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates a ...

nature. Banks may be

carbonate A carbonate is a salt of carbonic acid (H2CO3), characterized by the presence of the carbonate ion, a polyatomic ion with the formula . The word ''carbonate'' may also refer to a carbonate ester, an organic compound containing the carbonate g ...

terrigenous In oceanography, terrigenous sediments are those derived from the erosion of rocks on land; that is, they are derived from ''terrestrial'' (as opposed to marine) environments. Consisting of sand, mud, and silt carried to sea by rivers, their ...

. In tropical areas some banks are submerged

atoll An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical oceans and seas where corals can gr ...

s. As they are not associated with any

landmass A landmass, or land mass, is a large region or area of land. The term is often used to refer to lands surrounded by an ocean or sea, such as a continent or a large island. In the field of geology, a landmass is a defined section of continental ...

, banks have no outside source of

sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...

s. Carbonate banks are typically platforms, rising from the ocean depths, whereas terrigenous banks are elevated sedimentary deposits.

Seamount A seamount is a large geologic landform that rises from the ocean floor that does not reach to the water's surface (sea level), and thus is not an island, islet or cliff-rock. Seamounts are typically formed from extinct volcanoes that rise abru ...

s, by contrast, are mountains rising from the

deep sea The deep sea is broadly defined as the ocean depth where light begins to fade, at an approximate depth of 200 metres (656 feet) or the point of transition from continental shelves to continental slopes. Conditions within the deep sea are a combin ...

and are steeper and higher in comparison to the surrounding

.Farallones Marine Sanctuary Association
Islands, Banks & Seamounts: Geologic Features Under the Sea
. Examples of these are Pioneer and Guide Seamounts, west of the

Farallon Islands The Farallon Islands, or Farallones (from the Spanish ''farallón'' meaning "pillar" or "sea cliff"), are a group of islands and sea stacks in the Gulf of the Farallones, off the coast of San Francisco, California, United States. The island ...

. The Pioneer Seamount has a depth of 1,000 meters, In other cases, parts of a bank may reach above the water surface, thereby forming

island An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island ...

Important banks

The largest banks in the world are: #

(280,000 km²) - terrigenous bank #

Agulhas Bank The Agulhas Bank (, from Portuguese for Cape Agulhas, ''Cabo das Agulhas'', "Cape of Needles") is a broad, shallow part of the southern African continental shelf which extends up to south of Cape Agulhas before falling steeply to the abyssal pl ...

(116,000 km²) #

Great Bahama Bank The Bahama Banks are the submerged carbonate platforms that make up much of the Bahama Archipelago. The term is usually applied in referring to either the Great Bahama Bank around Andros Island, or the Little Bahama Bank of Grand Bahama Island ...

(95,798.12 km², has islands, area without islands) #

Saya de Malha The Saya de Malha Bank (also the Sahia de Malha Bank, modern Portuguese: ''saia de malha'', English: ''mesh skirt'') or Mesh Skirt Bank, is one of the largest submerged ocean banks in the world, a part of the vast undersea Mascarene Plateau. ...

(35,000 km², excluding the separate North bank, least depth 7 m) #

Seychelles Bank The Mascarene Plateau is a submarine plateau in the Indian Ocean, north and east of Madagascar. The plateau extends approximately , from Seychelles in the north to Réunion in the south. The plateau covers an area of over of shallow water, wi ...

(31,000 km², including islands of 266 km²) #

Georges Bank Georges Bank (formerly known as St. Georges Bank) is a large elevated area of the sea floor between Cape Cod, Massachusetts (United States), and Cape Sable Island, Nova Scotia (Canada). It separates the Gulf of Maine from the Atlantic Ocean. Th ...

(28,800 km²) - terrigenous bank #

Lansdowne Bank Lansdowne Bank, sometimes called Landsdowne Bank, is an extensive submerged bank located between the main island of New Caledonia and the Chesterfield Islands, in the easternmost part of the Coral Sea. It covers an area of ,Le parc naturel de la mer de Corail
p. 26 west of

New Caledonia ) , anthem = "" , image_map = New Caledonia on the globe (small islands magnified) (Polynesia centered).svg , map_alt = Location of New Caledonia , map_caption = Location of New Caledonia , mapsize = 290px , subdivision_type = Sovereign st ...

, least depth 3.7 m) #

(17,600 km², least depth 13 m) #

Little Bahama Bank The Bahama Banks are the submerged carbonate platforms that make up much of the Bahama Archipelago. The term is usually applied in referring to either the Great Bahama Bank around Andros Island, or the Little Bahama Bank of Grand Bahama Island ...

(14,260.64 km², has islands, area without islands) #

Great Chagos Bank The Great Chagos Bank, in the Chagos Archipelago, about south of Maldives, is the largest atoll structure in the world, with a total area of . The atoll is administered by the United Kingdom through the British Indian Ocean Territory (BIOT) ...

(12,642 km², including islands of 4.5 km²) #

Reed Bank Reed Tablemount (also referred to as Reed Bank, Recto Bank and several other names) is a large tablemount or guyot in the South China Sea north-east of Dangerous Ground and north-east of the Spratly Islands. It covers an area of , but with depth ...

Spratly Islands The Spratly Islands ( fil, Kapuluan ng Kalayaan; zh, c=南沙群島/南沙群岛, s=, t=, p=Nánshā Qúndǎo; Malay, id, Kepulauan Spratly; vi, Quần đảo Trường Sa) are a disputed archipelago in the South China Sea. Composed o ...

(8,866 km², least depth 9 m) # Caicos Bank,

Caicos Islands The Turks and Caicos Islands (abbreviated TCI; and ) are a British Overseas Territory consisting of the larger Caicos Islands and smaller Turks Islands, two groups of tropical islands in the Lucayan Archipelago of the Atlantic Ocean and nor ...

(7,680 km², including islands of 589.5 km²) #

Macclesfield Bank Macclesfield Bank is an elongated sunken atoll of underwater reefs and shoals in the South China Sea. It lies east of the Paracel Islands, southwest of Pratas Island and north of the Spratly Islands. It is about long from southwest to northeast ...

(6,448 km², least depth 9.2 m) # North Bank or Ritchie Bank (5,800 km², north of

, least depth <10 m) #

Cay Sal Bank Cay Sal Bank ( es, Placer de los Roques) is the third largest (after Great Bahama Bank and Little Bahama Bank) and the westernmost of the Bahama Banks. It is located between 23º27'N - 24º10'N and 079º25'W – 080º35'W. In a geographical sens ...

(5,226.73 km², including islands of 14.87 km²) #

Rosalind Bank Rosalind Bank, also called Rosalinda or Rosa Linda Bank ( es, Placer de Rosalinda), is a large, completely submerged bank or atoll in the western Caribbean Sea. It is the culmination of an area of coral reef, some 300 km (186 mi) long, that exten ...

(4,500 km², least depth 7.3 m) #

Bassas de Pedro Bassas de Pedro, also known as Manjappar or Pedro Bank, is a submerged bank or sunken atoll belonging to the Amindivi Subgroup of islands of the Union Territory of Lakshadweep, India, with a distance of south of the city of Delhi. . Geograph ...

(2,474.33 km², least depth 16.4 m), part of the

Amindivi The Aminidivi Islands, are one of the three island subgroups in the Union Territory of Lakshadweep, India. It is the northern group of the Lakshadweep, separated from the Laccadive Islands subgroup roughly by the 11th parallel north. The total ...

Subgroup of

Lakshadweep Lakshadweep (), also known as Laccadives (), is a union territory of India. It is an archipelago of 36 islands in the Arabian sea, located off the Malabar Coast. The name ''Lakshadweep'' means "one lakh islands" in Sanskrit, though the Lac ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

Notes

External links

Definitions – Islands, Banks & Seamounts: Geologic Features Under the Sea
{{fishing by country Physical oceanography

Types

Important banks

See also

Notes

External links