Pacific Ocean Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south and is bounded by Asia and Australia in the west and the Americas in the east. At in area (as defined with an Antarctic southern border), this largest division of the World Ocean—and, in turn, the hydrosphere—covers about 46% of Earth's water surface and about one-third of its total surface area, making it larger than all of Earth's land area combined. The centers of
Ocean planet Ocean planet An ocean planet, ocean world, water world, aquaplanet or panthalassic planet is a type of terrestrial planet that contains a substantial amount of water either at its surface or subsurface. The term "ocean world" is also used sometimes for astronomical bodies with an ocean composed of a different fluid, such as lava (the case of Io) or ammonia (the case of Titan's inner ocean). Earth is the only known astronomical object to have bodies of "liquid" water on its surface, although several exoplanets have been found with the right conditions to support liquid water. For exoplanets, current technology