An ocean is a large body of saline water. About 97.5% of the total water of the planet Earth is saline. There are 5 oceans on the Earth, and are given in order from largest in size to the smallest:

  1. Pacific Ocean (Largest)
  2. Atlantic Ocean
  3. Indian Ocean
  4. Antarctic Ocean, and
  5. Arctic Ocean (Smallest)

A Sea is normally a part of an ocean. An ocean near the land is usually called a sea. And, few seas are fully enclosed by land. For example, the Caspian Sea is the largest enclosed inland body of water on Earth. So the Caspian Sea is also called a lake. And, it is the largest lake in the world.


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