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The LOSC as a Package Deal and Its Implications for Determination of Customary International Law


This article revisits the package deal nature of the United Nations Convention on the Law of the Sea (LOSC) and its implications for determining customary international law. A survey of the case law illustrates that the International Court of Justice (ICJ) has not given particular weight to the fact that the LOSC was negotiated and accepted as a package deal. Nevertheless, the ICJ’s declaration that Article 121, paragraph 3 of the LOSC is a customary rule tends to be based on a ‘package deal approach’, which focuses on the textual and logical links between the paragraphs that manifest an ‘indivisible régime’. By exploring the difficulties of determining the customary status of Article 76(2)–(7) concerning the continental shelf beyond 200 nautical miles, which may arise in the pending Nicaragua v. Colombia II case, this article calls for a cautious attitude towards determination of customary rules from the LOSC.