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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.
Quick Answer. Australia is surrounded by the Pacific, Southern and Indian Oceans. The Timor, Tasman and Coral Seas also lie on the outside of the country. The landmass of Australia is approximately 2,941,300 square miles, making it the sixth largest country in the world.