This book provides a guide to the modern law of maritime boundary delimitation. The law of maritime boundaries has seen substantial evolution in recent decades. The book provides an overview of the law in this field, and its development through the United Nations Convention on the Law of the Sea (UNCLOS), which set out the framework of the modern law in 1982. The Convention itself has since been substantially built upon and clarified by a series of judicial and arbitral decisions in boundary disputes between sovereign states, which themselves also built upon earlier case law. The book dissects each of the leading international judgments and awards since the North Sea Continental Shelf cases in 1969, providing a full analysis of the issues and context in each case, explaining their fundamental importance to shaping the law. Technological developments in the exploitation of maritime natural resources (including oil and gas) have provided a significant impetus for recent boundary disputes, as they have made the resources found in remote areas of the ocean and seabed more accessible. However, these resources cannot effectively be exploited at the moment, as hundreds of maritime boundaries worldwide remain undelimited. The book also identifies key issues in maritime delimitation which have yet to be resolved, and sets out the possible future direction the law may take in resolving them.