How many seas on earth?

Seven Seas. The "Seven Seas" (as in the idiom "sail the Seven Seas") is an ancient phrase for all of the world's oceans. Since the 19th century, the term has been taken to include seven oceanic bodies of water: the Arctic Ocean. read more

For that reason, the Earth is often said to have seven seas. There are also many smaller bodies of water called seas. Some, like the Mediterranean Sea and the Red Sea, are large geographically distinct inlets of ocean water. read more

Even then the ancients later believed that there were only 7 seas, the Mediterranean, the Caspian, the Adriatic, the Red Sea, the Black Sea, the Persian Gulf and the Indian Ocean. The number of oceans in the world varies on how you look at it. read more