The world's largest ocean is the Pacific Ocean. Covering more than 63 million square miles (165 million square kilometers), it spans from the Arctic Ocean in the north to the Southern Ocean in the south and lies between Asia and Australia on the west and the Americas on the east. The Pacific Ocean is not only the largest ocean but also the deepest, with the Mariana Trench reaching depths of over 36,000 feet (approximately 11,000 meters). This massive body of water plays a vital role in regulating the Earth’s climate, supporting diverse marine ecosystems, and facilitating international trade and travel through its extensive shipping routes.