The term 'The Bounding Main' is a phrase used to refer to the OCEAN, and is derived from an old English SEA shanty. The phrase can be broken down into three words: OCEAN (5 letters), SEA (3 letters), and Opensea (7 letters). The word 'OCEAN' refers to the vast body of salt water that covers most of the Earth's surface, while 'SEA' is a smaller body of salt water that is partially enclosed by land. Finally, 'opensea' is a term used to describe the open waters of the OCEAN that are not enclosed by land.