Large bodies of salt water are called seas or oceans.
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An ocean.
Some names of bodies of salt water include oceans (e.g. Pacific Ocean, Atlantic Ocean), seas (e.g. Mediterranean Sea, Caribbean Sea), gulfs (e.g. Gulf of Mexico, Gulf of Oman), and bays (e.g. San Francisco Bay, Hudson Bay).
Salt dissolved in water is called a salt solution.
The combination of salt water and fresh water is called brackish water.
Salt dissolved in water is known as a saline solution.