The Pacific Ocean is our planet’s deepest body of water, with an average depth of approximately 4,000 meters (13,000 feet). The deepest place on Earth, known as Challenger Deep, extends to a depth of more than 11,000 meters (36,000 feet) and is found in the Mariana Trench, in the Pacific. Holding more than half of the Earth's open water supply, the Pacific Ocean was named by explorer Ferdinand Magellan in 1520, who called this body of water "pacific," due to the calmness of the water at the time.

Source: Oceanexplorer