The largest ocean in the world is the Pacific Ocean. It covers approximately 63 million square miles (about 165 million square kilometers), which is around 46% of Earth's water surface and about 32% of the planet's total surface area. The Pacific Ocean is not only the largest by area but also the deepest, with the Mariana Trench reaching depths of over 36,000 feet (about 11,000 meters). It stretches from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia on the west and the Americas on the east.