The term 'MARINERS' Milieu' refers to the environment in which sailors and other seafarers operate. This includes the SEA, OCEAN, and seven seas. The SEA is a large body of salt water that is partially enclosed by land, while the OCEAN is a continuous body of salt water that covers most of the Earth's surface. The seven seas are the Arctic, Atlantic, Indian, Pacific, Mediterranean, Caribbean, and South China SEA. Together, these three bodies of water form the MARINERS' Milieu.