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Panthalassa, also known as the Panthalassic or Panthalassan Ocean, (from Greek Ïá¾¶Î½ all and Î¸Î¬Î»Î±ÏÏÎ± sea), was the superocean that surrounded the supercontinent Pangaea. During the PaleozoicâMesozoic transition c. 250 Ma it occupied almost 70% of Earth's surface.
An inland sea surrounded by Europe, Asia, and Africa. It connects with the Atlantic Ocean through the Strait of Gibraltar; with the Black Sea through the Dardanelles, the Sea of Marmara, and the Bosporus; and with the Red Sea through the Suez Canal.. 1. (Placename) a large inland sea between S Europe, N Africa, and SW Asia: linked with the Atlantic by the Strait of Gibraltar, with the Red Sea by the Suez Canal, and with the Black Sea by the Dardanelles, Sea of Marmara, and Bosporus; many ancient civilizations developed around its shores.