Definition of mare clausum in English:

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mare clausum

Pronunciation: /ˌmärā ˈklousəm/ /ˈklô-/

noun (plural maria clausa /ˌmärēə ˈklousə/ /ˈklô-/)

The sea under the jurisdiction of a particular country.
Example sentences
  • The Dutch East India Company, though nominally under Dutch authority, was clearly a state in Asia and asserted mare clausum not only around the Spice Islands but also in parts of the Indian Ocean.
  • The article analyzes the legal and political standing of the Soviet juridical theory of mare clausum as applied to the Baltic Sea.
  • In this guarded fashion the claim that the seas of the world outside Europe were Iberian maria clausa was breached.


Latin, 'closed sea'.

For editors and proofreaders

Syllabification: ma·re clau·sum

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