The Four Largest Oceans on Earth

Ranked by surface area:

1. Pacific Ocean: ~155 million km² (60M sq mi) – largest, covers 1/3 of Earth's surface.
2. Atlantic Ocean: ~106 million km² (41M sq mi) – 2nd largest.
3. Indian Ocean: ~73 million km² (28M sq mi) – 3rd largest.
4. Arctic Ocean: ~14 million km² (5.4M sq mi) – smallest, shallowest, mostly ice‑covered.

(The Southern Ocean is sometimes recognized as the 4th or 5th, but these four are the traditional major oceans.)