From Openwaterpedia

noun - An ocean is a body of saline water that composes much of a planet's hydrosphere, occupying more than two-thirds of Earth's surface. On Earth, an ocean is one or all of the major divisions of the planet's World Ocean – which are, in descending order of area, the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean (or Antarctic Ocean), and Arctic Ocean. The word sea is often used interchangeably with "ocean" in American English but, strictly speaking, a sea is a body of saline water (generally a division of the World Ocean) that land partly or fully encloses.

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