The Ocean is the large body of saline waters that comprise much of a planet's hydroshere. On Earth, an ocean appears as one of the major conventional divisions of the World Ocean. It is divided into five zones comprised by the Pacific, Atlantic, Indian, Southern (Antarctic), and Artic Oceans. Generally, the term "ocean" is used interchangeably with the term "sea". Strictly speaking, a sea is a body of saline water (generally a division of the world ocean) partly or fully enclosed by land, though "the sea" refers also to the oceans.
Regarding the villain tournaments, the World Ocean is displayed as one of the known zones of Earth. Particularly, part of the coflict, resulted between villains and heroes respectively, takes place in the hold of ships, situated in the waters of the ocean. In addition, it is also featured as one of the main battle sceneries.