The principal subject of this doctoral dissertation is the quest for a well-balanced legal system that reconciles predictability and flexibility in the law of maritime delimitation. As with all types of law, the law of maritime delimitation should have a certain degree of predictability. On the other hand, as maritime delimitation cases differ, flexible considerations of geographical and non-geographical factors is also required in order to achieve equitable results. How, then, is it possible to ensure predictability while taking into account a diversity of factors in order to achieve an equitable result? In the author's view, this is the core of the law of maritime delimitation. In order to consider this question, this doctoral dissertation examined three major aspects: the evolution of the law of maritime delimitation, a comparative study of case-law and State practice, and some theoretical issues of that law