* Open seas: Open seas are large bodies of salt water that are not surrounded by land. The open seas include the Atlantic Ocean, the Pacific Ocean, the Indian Ocean, and the Arctic Ocean.
* Marginal seas: Marginal seas are smaller bodies of salt water that are partially surrounded by land. Marginal seas include the Baltic Sea, the Mediterranean Sea, and the Caribbean Sea.
* Inland seas: Inland seas are bodies of salt water that are completely surrounded by land. Inland seas include the Caspian Sea and the Aral Sea.
* Epicontinental seas: Epicontinental seas are shallow bodies of water that are located on the continental shelf. Epicontinental seas include the North Sea and the Yellow Sea.
* Intercontinental seas: Intercontinental seas are seas that are located between two or more continents. Intercontinental seas include the Mediterranean Sea and the Caribbean Sea.
* Intracontinental seas: Intracontinental seas are seas that are located within a single continent. Intracontinental seas include the Caspian Sea and the Aral Sea.