Covering about 63 million square miles (163 million km²), roughly one‑third of Earth’s surface, the Pacific Ocean is big enough to fit all the world’s landmasses and still leave spare space. It’s not just wide; it stretches about 12,300 miles (19,800 km) from west to east.

Average depths sink to 3,682 m (12,080 ft) and plunge to nearly 11,000 m (36,000 ft) in the Challenger Deep, far deeper than Mount Everest is tall. Altogether, the ocean holds roughly half of the world’s ocean water , with a volume estimated at 714 million km³.

The Pacific isn’t a blank blue expanse: it contains around 25,000 islands, more than any other ocean. These islands fall into three broad regions: Micronesia, Melanesia and Polynesia, and range from towering volcanic peaks to low coral atolls.

Plate tectonics carved this basin from a prehistoric super‑ocean called Panthalassa, and the Pacific continues to evolve as its margins slowly shrink by about an inch a year, feeding the volatile “Ring of Fire” that rings its rim.

On flat maps, the Pacific often seems modest because cartographers compress it between continents. The overlay from World in Maps corrects that impression by showing how much blue remains after the continents are dropped in.

Recognising the ocean’s true scale underscores its global importance: it regulates climate, hosts a vast web of life and supports millions of people. Protecting it from overfishing, pollution, and climate change isn’t just an environmental cause but a necessity for the planet we all share.