The Koro Sea or Sea of Koro is a

sea A sea is a large body of salt water. There are particular seas and the sea. The sea commonly refers to the ocean, the interconnected body of seawaters that spans most of Earth. Particular seas are either marginal seas, second-order section ...

in the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

surrounded by the islands of

Fiji Fiji, officially the Republic of Fiji, is an island country in Melanesia, part of Oceania in the South Pacific Ocean. It lies about north-northeast of New Zealand. Fiji consists of an archipelago of more than 330 islands—of which about ...

. It is named after Koro Island.

Geography

The Koro Sea lies in the southwestern

. It is surrounded by the more than 300 islands of

, and is bordered by

Viti Levu Viti Levu (pronounced ; ) is the largest island in Fiji. It is the site of the country's capital and largest city, Suva, and home to a large majority of Fiji's population. Geology Fiji lies in a plate tectonics, tectonically complex area betwe ...

to the south, Vanua Levu and

Taveuni Taveuni (pronounced ) is the third-largest island in Fiji, after Viti Levu and Vanua Levu, with a total land area of . The cigar-shaped island, a massive shield volcano which rises from the floor of the Pacific Ocean, is situated east of Vanua ...

to the north, Kadavu to the west, and the

Lau Islands The Lau Islands (also called the Lau Group, the Eastern Group, the Eastern Archipelago) of Fiji are situated in the southern Pacific Ocean, just east of the Koro Sea. Of this chain of about sixty islands and islets, about thirty are inhabited. T ...

to the east. It is about north of

Auckland Auckland ( ; ) is a large metropolitan city in the North Island of New Zealand. It has an urban population of about It is located in the greater Auckland Region, the area governed by Auckland Council, which includes outlying rural areas and ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

. It is named after the

volcanic island Geologically, a volcanic island is an island of volcanic origin. The term high island can be used to distinguish such islands from low islands, which are formed from sedimentation or the uplifting of coral reefs (which have often formed ...

of Koro, an island of the Fijian archipelago located in the northwestern part of the Koro Sea.

Physical description

The Koro Sea covers an area of about . It is relatively shallow: its maximum depth is , and on average its northern and western portions are shallower than its eastern portion. 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 ...

is formed by heavy basaltic rocks characteristic of

ocean basin In hydrology, an oceanic basin (or ocean basin) is anywhere on Earth that is covered by seawater. Geologically, most of the ocean basins are large  geologic basins that are below sea level. Most commonly the ocean is divided int ...

s. Rocks, sandbars and numerous

coral reef A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in group ...

s between the islands occupy about of the sea, making navigation possible only through a few narrow passages in its central portion. The sea separates the two underwater platforms from which the Fiji Islands rise. An oceanic ridge that crosses the Nanuku Passage in the northwestern part of the sea connects the two platforms. The region has a high level of

seismic activity An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they ...

Climate

The entire Koro Sea lies in the

tropics The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

. Tropical air currents circulate over it all year round, although changes in air temperature with the change of season is documented. The

trade winds The trade winds or easterlies are permanent east-to-west prevailing winds that flow in the Earth's equatorial region. The trade winds blow mainly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere ...

predominate and

tropical cyclone A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its locat ...

s form in the warm season.

Flora and fauna

The Koro Sea is part of the marine ecoregion of the Fiji Islands, which is included within the Central Indo-Pacific biogeographic region. In the field of

zoogeography Zoogeography is the branch of the science of biogeography that is concerned with geographic distribution (present and past) of animal species. As a multifaceted field of study, zoogeography incorporates methods of molecular biology, genetics, mo ...

, the benthic fauna of the

continental shelf A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an islan ...

and the sandbanks of the islands up to depths of also corresponds to the Indo-Pacific biogeographic region within the tropical framework More than 300

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of hard corals, 1,500 of

fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...

, and 7,000 of

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

s are found there.

Transportation

Passenger A passenger is a person who travels in a vehicle, but does not bear any responsibility for the tasks required for that vehicle to arrive at its destination or otherwise operate the vehicle, and is not a steward. The vehicles may be bicycles, ...

ferries A ferry is a boat or ship that transports passengers, and occasionally vehicles and cargo, across a body of water. A small passenger ferry with multiple stops, like those in Venice, Italy, is sometimes referred to as a water taxi or water bus. ...

provide periodical service from the Koro Sea to Ovalau Island. The Nanuku Passage serves as a sea route for importing products into the Koro Sea region.

Recreation

Scuba diving Scuba diving is a Diving mode, mode of underwater diving whereby divers use Scuba set, breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. The word ''scub ...

and

snorkeling Snorkeling (American and British English spelling differences#Doubled in British English, British and Commonwealth English spelling: snorkelling) is the practice of human swimming, swimming face down on or through a body of water while breathing ...

are possible in the Koro Sea but are not widely practiced because of the difficulty of safe navigation of its waters.

References

Citations

Bibliography

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