This is the latest in a series of annual surveys in this Journal reviewing dispute settlement in the law of the sea, both under Part XV of the UN Convention on the Law of the Sea and outside the framework of the Convention. It covers developments during 2018. The most significant developments during the year were the judgment of the International Court of Justice in Costa Rica v. Nicaragua, delimiting the maritime boundaries between the two States’ overlapping maritime zones in both the Caribbean Sea and the Pacific Ocean. [---]