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The World's Five Oceans Explained

Tap an ocean to see key facts.

Pacific Ocean

The largest and deepest of the world's oceans, stretching between Asia and the Americas and covering more area than all of Earth's land combined.

Atlantic Ocean

The second-largest ocean, separating the Americas from Europe and Africa, and historically one of the most important routes for global trade and exploration.

Indian Ocean

The third-largest ocean, bordered by Africa, Asia, and Australia, known for warm surface waters and monsoon wind patterns that have shaped regional trade for centuries.

Southern Ocean

Surrounding Antarctica, the Southern Ocean was officially recognized as a distinct ocean by name in 2021 by the National Geographic Society, though its boundaries are still defined differently by different organizations.

Arctic Ocean

The smallest and shallowest of the five oceans, located around the North Pole and largely covered by sea ice for much of the year, though that ice cover has been shrinking due to warming temperatures.

Why some sources say four oceans, not five

For a long time, only four oceans were officially recognized, with the waters around Antarctica considered part of the Pacific, Atlantic, and Indian Oceans; the Southern Ocean's recognition as a distinct fifth ocean is relatively recent and not yet universally adopted by every geographic authority.

Frequently Asked Questions

Are the world's oceans actually separate bodies of water?

Not really β€” all of Earth's oceans are physically connected as one continuous global ocean; the division into five named oceans is a geographic convention used for convenience rather than a reflection of physically separate water bodies.

Which ocean is the saltiest?

The Atlantic Ocean has notably high average salinity, partly due to high evaporation rates in certain regions, though salinity varies significantly across all oceans depending on location.