This study aims to reconstruct the regulation of rights to control maritime space from an integrative perspective of agrarian law and maritime law in Indonesia, amidst the growing practice of privatizing coastal and maritime areas through administrative land instruments and permits for the use of maritime space. The study employs a non-empirical legal methodology using a statutory approach, a conceptual approach, and a legal harmonization approach through an analysis of the Land Law (UUPA), the Maritime Law, coastal zone regulations, Constitutional Court rulings, as well as the doctrines of agrarian law and marine governance. The research findings indicate that the national legal system still suffers from normative disharmony regarding the legal status of maritime space due to the unclear relationship between the state’s sovereign rights, administrative utilization rights, and private property rights. The practice of granting exclusive rights over maritime space has been shown to contradict the principle of the public domain, the social function of agrarian resources, and the protection of coastal communities’ rights. Legal reconstruction is necessary through a public trusteeship model that positions the state as the steward of public interests with strict limitations on the privatization of maritime space to achieve maritime agrarian justice and national ecological sustainability.
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