- the main body of a sea or ocean, especially the part that is outside territorial waters and not enclosed, or partially enclosed, by land.
Examples from the Web for open sea
Historical Examples of open sea
At dawn we had completed most of the open-sea passage on the return journey.The Blocking of Zeebrugge
Alfred F. B. Carpenter
The open-sea or pelagic haunt includes all the brightly illumined surface waters beyond the shallow water of the shore area.
These open-sea young eels are known as Leptocephali, a name given to them before their real nature was proved.
Shipbuilding, including steamers for open-sea navigation, is on the increase.