The largest ocean in surface area is the Pacific Ocean. Covering more than 63 million square miles, it is larger than all of the Earth's landmasses combined. Spanning from the Arctic in the north to the Southern Ocean in the south, the Pacific is bordered by Asia and Australia on the west and the Americas on the east. It is known for its vast biodiversity, including numerous marine species and ecosystems. The ocean plays a crucial role in the world’s climate and weather patterns, as well as global shipping and trade routes.