This text traces the historical evolution of the archipelagic concept in international law and examines the definition of archipelagos and archipelagic states. The nature, status and regime of the waters of different types of archipelagos is examined and analyzed from the perspective of archipelagic states and is based on the requirement of such states for territorial integrity and self-determination.;The book introduces the concept of ""Ocean States"" and links it with the archipelagic concept. The archipelagic concept is viewed as a practical, as well as a functional, basis for the determination of the territorial limits of Ocean States.