The Pacific Ocean (from the Latin name Mare Pacificum, "peaceful sea", bestowe upon it by the Portuguese explorer Ferdinand Magellan) is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to Antarctica in the south, bounded by Asia and Australia on the west and the Americas on the east. At 169.2 million square kilometers (65.3 million square miles) in area, this largest division of the World Ocean – and, in turn, the hydrosphere – covers about 46% of the Earth's water surface and about 32% of its total surface area, making it larger than all of the Earth's land area combined. The equator subdivides it into the North Pacific Ocean and South Pacific Ocean. The Mariana Trench in the western North Pacific is the deepest point in the Pacific and the world, reaching a depth of 10,911 metres (35,798 ft).