Proper noun
Panthalassa
(geography) The prehistoric ocean surrounding Pangaea.
Pangaea straddled the equator and extended toward the poles, with a corresponding effect on ocean currents in the single great ocean (" Panthalassa ", the "universal sea"), and the Paleo-Tethys Ocean, a large ocean that was between Asia and Gondwana. Source: Internet
The remaining shores were surrounded by the world-ocean known as Panthalassa ("all the sea"). Source: Internet
The vast ocean of Panthalassa covered most of the northern hemisphere. Source: Internet