The largest oceanic body of water on Earth is the Pacific Ocean. Covering an area of approximately 63 million square miles (165 million square kilometers), it stretches between Asia and Australia on the west and the Americas on the east. The Pacific Ocean is not only the deepest ocean, with the Mariana Trench reaching a depth of about 36,000 feet (over 10,900 meters), but it also contains a diverse range of marine ecosystems. It plays a critical role in global weather patterns and commerce, making it one of the most important bodies of water on the planet.