The term 'NEPTUNE's Domain' refers to the OCEAN, seas, and SEA that are ruled by the god of the SEA, NEPTUNE. The OCEAN is a large body of salt water that covers most of the Earth's surface, and is made up of many smaller bodies of water, such as seas and seas. Seas are large bodies of salt water that are partially enclosed by land, while seas are smaller bodies of salt water that are completely surrounded by land. Thesea is a term used to refer to all of these bodies of water collectively.