The ocean that covers more than 70% of Earth's surface is the Pacific Ocean. It is the largest and deepest ocean in the world, spanning approximately 63 million square miles (165 million square kilometers). The Pacific Ocean is bordered by numerous countries and extends from the Arctic in the north to the Southern Ocean in the south. It plays a vital role in global weather patterns and marine biodiversity, hosting a wide variety of ecosystems, including coral reefs, deep-sea trenches, and volcanic islands. The ocean is also crucial for international trade and transportation.