What is the largest ocean in the world?

The Pacific Ocean is the world's largest, covering ~165 million km² more than all land areas combined containing over half of the world's oceanic water.

• Stretches from Arctic (north) to Antarctic (south).
• Contains the Mariana Trench Earth's deepest point at ~11,034 metres.
• Named by Ferdinand Magellan (1521) from Latin mare pacificum ("peaceful sea").
• Contains over 25,000 islands.

The Pacific Ocean is the world's largest, covering over 165 million km² and containing Earth's deepest point, the Mariana Trench.