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Wikipedia portal for content related to Oceans

The Oceans Portal
A portal dedicated to oceans, seas, oceanography and related topics

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Introduction

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Earth's ocean, showing common divisions
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Map with five-oceans (approx. boundaries)
Earth's ocean

Main five oceans division:

Further subdivision:

Marginal seas
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Surface view of the Atlantic Ocean

The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as oceans (in descending order by area: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Antarctic/Southern Ocean, and the Arctic Ocean), and are themselves mostly divided into seas, gulfs and subsequent bodies of water. The ocean contains 97% of Earth's water and is the primary component of Earth's hydrosphere, acting as a huge reservoir of heat for Earth's energy budget, as well as for its carbon cycle and water cycle, forming the basis for climate and weather patterns worldwide. The ocean is essential to life on Earth, harbouring most of Earth's animals and protist life, originating photosynthesis and therefore Earth's atmospheric oxygen, still supplying half of it. (Full article...)

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Waves in Pacifica, California

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 sections of the oceanic sea (e.g. the Mediterranean Sea), or certain large, nearly landlocked bodies of water. (Full article...)

Oceanography (from Ancient Greek แฝ ฮบฮตฮฑฮฝฯŒฯ‚ (ลkeanรณs) 'ocean' and ฮณฯฮฑฯ†ฮฎ (graphแธ—) 'writing'), also known as oceanology, sea science, ocean science, and marine science, is the scientific study of the ocean, including its physics, chemistry, biology, and geology. (Full article...)

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๐Ÿ‘ A humpback whale swimming
A humpback whale (Megaptera novaeangliae)

Marine mammals are mammals that rely on marine ecosystems for their existence. They include animals such as cetaceans, pinnipeds, sirenians, marine otters, sea otters and polar bears. They are an informal group, unified only by their reliance on marine environments for feeding and survival.

Marine mammal adaptation to an aquatic lifestyle varies considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Pinnipeds are semiaquatic; they spend the majority of their time in the water but need to return to land for important activities such as mating, breeding and molting. Sea otters tend to live in kelp forests and estuaries. In contrast, the polar bear is mostly terrestrial and only goes into the water on occasions of necessity, and are thus much less adapted to aquatic living. The diets of marine mammals vary considerably as well; some eat zooplankton, others eat fish, squid, shellfish, or seagrass, and a few eat other mammals. While the number of marine mammals is small compared to those found on land, their roles in various ecosystems are large, especially concerning the maintenance of marine ecosystems, through processes including the regulation of prey populations. This role in maintaining ecosystems makes them of particular concern as 23% of marine mammal species are currently threatened. (Full article...)

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Selected list articles and Marine habitat topics

Tasks

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The following are images from various ocean-related articles on Wikipedia.

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In the news

1 April 2026 โ€“ Middle Eastern crisis
Red Sea crisis
29 March 2026 โ€“ Middle Eastern crisis
Bahrain imposes a nighttime maritime curfew from 6:00pm to 4:00am to restrict sea traffic and strengthen coastal security following reported attacks attributed to Iran. (AFP via L'Orient Today)
28 March 2026 โ€“ Middle Eastern crisis
Red Sea crisis
28 March 2026 โ€“
Twenty-two bodies are recovered from a vessel found adrift off the coast of Crete, Greece, according to the Greek coast guard. Twenty-six people are rescued by Frontex. Several survivors said some people were also thrown overboard into the Mediterranean Sea on the orders of a human trafficker during the journey. (Reuters)
26 March 2026 โ€“
Mexico's navy launches a search and rescue operation in the Caribbean Sea for two sailboats, which departed from Isla Mujeres with nine crew members, carrying humanitarian aid to Cuba after they failed to arrive in Havana as scheduled and lost communication. (Reuters)

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Seas


Oceanography

Associated Wikimedia

The following Wikimedia Foundation sister projects provide more on this subject:

Admiralty law

Admiralty and maritime law
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History
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Contract of carriage / charterparty
Parties
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International organizations
International conventions
International Codes

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