Whales are aquatic mammals that inhabit the world's oceans and seas. Their habitats vary depending on the species, but generally they can be found in both shallow and deep waters. The term 'WHALE's habitat' can refer to either the SEA or the OCEAN. The SEA is a large body of salt water that is partially enclosed by land, while the OCEAN is a vast expanse of interconnected waters that covers most of the Earth's surface. Both the SEA and the OCEAN provide whales with food, shelter, and a place to breed.