* Pacific Ocean - The largest ocean on Earth, it spans the equator for a significant portion of its width.

* Atlantic Ocean - Also a massive ocean, it intersects the equator and stretches from the Americas to Africa.

* Indian Ocean - The third largest ocean, the Indian Ocean crosses the equator between Africa and Asia.

While not technically a "sea" in the traditional sense, it's worth noting that the Equatorial Current also runs along the equator, moving eastward across the Pacific, Atlantic, and Indian Oceans.