Under the United Nations Convention on the Law of the Sea treaty ( UNCLOS ) , artificial islands are not considered harbor works ( Article 11 ) and are under the jurisdiction of the nearest coastal state if within ( Article 56 ) .
Under the United Nations Convention on the Law of the Sea treaty ( UNCLOS ) , artificial islands are not considered harbor works ( Article 11 ) . Such islands are part of the nearest coastal state if the island is within 200 nmi ( Article 56 ) .