This chapter explains the legal uncertainties arising in the continental shelf delimitation beyond 200 nautical miles. Given the special characters of the entitlement to the continental shelf beyond 200 nm in terms of its substantive, procedural, and institutional attributes, a great measure of uncertainty is introduced into the delimitation of the extended maritime areas, in particular with regard to the competence of international courts and tribunals and the applicable delimitation methodology. Clarification and refinement of these issues are vital for the pursuit of an equitable solution to maritime boundary-making and the stability of the law of maritime delimitation.