Maritime and underwater areas represent enormous zones where divergent legal regimes are applicable. We can separate them in three categories. Spaces in which the coastal state has full sovereignty (inner sea waters and territorial sea), spaces in which state has certain sovereign rights or jurisdictional authority (exterior sea zone,economic zone, continental shelf) and zones that none state can occupy and which reside to everyone (open sea and Zona). Straits are a narrow natural sea passage that connects two larger areas of the sea. They are divided into two groups: international straits (Gibraltar, Tirana, Bosporus, Dardanelles) and national straits (Corfu). The United Nations Convention on the Law of the Sea from 1982. establishes appropriate navigation regimes (freedom of navigation, harmless passage and transit, ie archipelago passage). Sea canals are artificial formations that are dug between two seas to shorten the waterway. They are also divided into two groups: international (legal regime of passage is regulated by an international treaty or unilateral declaration of the coastal state on freedom of passage for international use without discrimination) and national (passage is regulated by internal regulations of the coastal state).