Mare Clausum is a Latin term that translates to "closed sea." This term refers to the sea or ocean under the exclusive control of a nation, as opposed to the common property of all nations. Synonyms for the term Mare Clausum include closed sea, controlled sea, territorial waters, and exclusive economic zone. These synonyms are often used to describe the same concept of maritime zones and boundaries that determine the extent of a state's authority over the sea. In international law, the concept of Mare Clausum has been contested, with some nations advocating for open seas and shared resources, while others favor exclusive control over their waters.