A sea is the name generally given to a large amount of water lying on the Earth. It is typically smaller than an ocean but not always; frankly the whole classification thing is a mess.

Some seas are entirely enclosed by land, although lots of others aren't, and most rivers arise from seas. Or oceans. Actually come to think of it a lake could be a sea. Not sure what that leaves us, frankly.

Lots of fish live in the sea.

Examples of seas include:

- The Sargasso Sea

- The North Sea

- The Irish Sea

- The Sea of Tranquility (which isn't actually a sea, it's a place on the Moon)

- loads of others