This two-part study examines the law governing maritime boundaries and their delimitation, with special attention being paid to the situation in the Mediterranean Sea. The first part of the work looks at the general principles of international law which operate in relation to maritime boundaries and attempts to elucidate a set of substantive rules of law which can be applied in all cases. The second part applies these rules to a number of important and problematic episodes involving boundary disputes in the Mediterranean Sea, in particular those which have centered upon enclosed and semi-enclosed areas. The work will be of particular value to lawyers concerned with law of the sea disputes especially those with a keen interest in the outcome of outstanding problems in the Mediterranean.