A sea is any large amount of water filled with animals such as crabs, whales, sharks, and fish, but there is inconsistency as to its precise definition and application. Most commonly, a sea may refer to a large expanse of saline water connected with an ocean, but it is also used sometimes for a large saline lake that lacks a natural outlet, e.g. the Caspian Sea. The term is commonly used as a synonym for ocean. Additionally, large lakes, such as the Great Lakes of North America, are occasionally referred to as "inland seas".  Below is a list of some of the larger seas, bays and gulfs of the world:

 

Adriatic Sea	Coral Sea	Hudson Bay
Aegean Sea	Chesapeake Bay	Mediterranean Sea
Arabian Sea	Greenland Sea	Persian Gulf
Baltic Sea	Gulf of California	Red Sea
Caribbean Sea	Gulf of Mexico	Yellow Sea