Here are some of the major seas around the world:

Atlantic Ocean:

* North Atlantic:

* Baltic Sea

* Barents Sea

* Black Sea

* Celtic Sea

* Irish Sea

* North Sea

* Sea of Azov

* Sea of Marmara

* White Sea

* South Atlantic:

* Caribbean Sea

* Gulf of Guinea

* Gulf of Mexico

* Sargasso Sea

Pacific Ocean:

* North Pacific:

* Bering Sea

* East China Sea

* Japan Sea

* Okhotsk Sea

* Philippine Sea

* Sea of Japan

* Sea of Okhotsk

* Yellow Sea

* South Pacific:

* Coral Sea

* Tasman Sea

Indian Ocean:

* Arabian Sea

* Bay of Bengal

* Red Sea

* Persian Gulf

Arctic Ocean:

* Arctic Sea

Other:

* Mediterranean Sea

* Adriatic Sea

* Aegean Sea

* Tyrrhenian Sea

* Ionian Sea

* Caspian Sea (sometimes considered a lake)

* Aral Sea (now mostly a shrinking lake)

Important Note: There are many smaller seas and gulfs not listed here. This is just a selection of some of the most well-known seas.