The final judgment in the maritime boundary delimitation case between Ghana and Côte d’Ivoire was delivered by an ad hoc special chamber (the Chamber) of the International Tribunal for the Law of the Sea (ITLOS) on 23 September 2017. The decision addressed important legal questions relating not only to maritime boundary delimitation but also to the balancing of various rights and interests at the provisional measures stage and international responsibility for unilateral resource exploitation activities in disputed zones pending delimitation. This article analyses the decision of the Chamber with respect to its findings on tacit boundary agreements, delimitation methodology, and international responsibility.