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The paper explores the purpose and value of setting maritime limits and boundaries and, in particular, argues that to do so is crucial in order to provide a clear jurisdictional framework so as to better realise the benefits to be derived from the value marine resources contained within the maritime spaces claimed by coastal States. The problems associated with maritime jurisdictional uncertainty are also noted. The spatial limits of maritime claims under international law are outlined together with the key ways in which the limits of such claims can be established. Challenges and uncertainties in defining maritime limits and boundaries are then highlighted with particular reference to the Pacific island States regional context.