A plethora of international bodies and international instruments regulate, influence and shape what is happening in the oceans. The many regimes involved and the resulting legal cacophony contribute to persisting challenges in ocean governance. Regime Interaction in Ocean Governance: Problems, Theories and Methods identifies the problems raised by regime interaction in ocean governance, discusses the relevant theoretical approaches, and explores possible solutions. It ultimately highlights how regime interaction in international law, specifically in oceans matters, not only consists of a problem to be solved, but also of a phenomenon to be better understood and benefited from.