mare clausum (mair-ee ormahr-ee klaw-z[schwa]m). [Latin “closed sea”] A sea or other body of navigable water that is under the jurisdiction of a particular nation and is closed to other nations.
mare liberum (mair-ee ormahr-ee lib-[schwa]r-[schwa]m orlI-b[schwa]r-[schwa]m). [Latin “free sea”]
1. A sea or other body of navigable water that is open to all nations.
2. FREEDOM OF THE SEAS.