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Introduction

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. It originated photosynthesis and therefore Earth's atmospheric oxygen, and still supplies half of it. (Full article...)

Waves in Pacifica, California

A sea is a large body of salt water. The term has two distinct meanings. The first is the interconnected body of seawater that spans most of Earth, known as the sea or the ocean. The second is a named body of water: usually either a marginal sea (a second-order section of the oceanic sea such as the Mediterranean Sea), or a large, nearly landlocked body of water. (Full article...)

Oceanography (from Ancient Greek ὠκεανός (ōkeanós) 'ocean' and γραφή (graphḗ) '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...)

Ming China's treasure fleet undertook maritime expeditions between 1405 and 1433. The Yongle Emperor ordered the construction of the fleet in 1403. The grand project resulted in seven far-reaching ocean voyages to the coastal territories and islands of the South China Sea and Indian Ocean. Admiral Zheng He was commissioned to command the fleet for the expeditions. Six of the voyages occurred during the Yongle Emperor's reign (r. 1402–1424) and the seventh voyage occurred during the Xuande Emperor's reign (r. 1425–1435). The first three voyages reached up to Calicut on India's Malabar Coast, while the fourth voyage went as far as Hormuz in the Persian Gulf. In the last three voyages, the fleet traveled up to the Arabian Peninsula and East Africa.

The Chinese expeditionary fleet was heavily militarized and carried great amounts of treasures, which served to project Chinese power and wealth to the known world. They brought back many foreign ambassadors whose kings and rulers were willing to declare themselves tributaries of China. During the course of the voyages, they destroyed Chen Zuyi's pirate fleet at Palembang, captured the Sinhalese Kotte kingdom of King Alakeshvara, and defeated the forces of the Semudera pretender Sekandar in northern Sumatra. The Chinese maritime exploits brought many countries into China's tributary system and sphere of influence through both military and political supremacy, thus incorporating the states into the greater Chinese world order under Ming suzerainty. Moreover, the Chinese restructured and established control over an expansive maritime network in which the region became integrated and its countries became interconnected on an economic and political level. (Full article...)

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An aerial view of NOAAS Pisces (R 226)

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In the news

3 September 2026 –
Six crew members are referred to court as part of the investigation into the ship collision in the Sea of Marmara yesterday, while the search continues for the ten Turkish crew members aboard the sunken MV Tuğberk İmamoğlu cargo ship. (BBC News)
2 September 2026 –
The MV Tuğberk İmamoğlu cargo ship sinks in the Marmara Sea after a collision with an oil tanker, leaving ten people missing. (Euronews)
25 August 2026 – Operation Southern Spear
The U.S. military launches a strike against a vessel in the Caribbean Sea allegedly carrying drug smugglers, killing four people. (The Guardian)
24 August 2026 – Operation Southern Spear
The United States Southern Command's Joint Task Force Western Hemisphere launches a strike on a vessel in the eastern Pacific Ocean on alleged drug traffickers, killing two people. (CNN) (PBS)
23 August 2026 –
The Indian Coast Guard and Navy's Eastern Naval Command reports that two crew members from the Panama-flagged MV Ocean Winner have been rescued after it sank off the coast of Bay of Bengal in eastern India. (Times of India) (New Indian Express)

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