<![CDATA[The existence of land is an important natural resource for the Republic of Indonesia, which is regulated in Law Number 5 of 1960 concerning Basic Agrarian Regulations, in Article 1 paragraph (1). Article 6 of the UUPA states, "All land rights have a social function. The land referred to here is not only related to land on land but also land in waters, as regulated in the UUPA. Land rights are not only limited to land but also include water areas or coastal borders. This is also in accordance with Government Regulation Number 18 of 2021, the function of legal norms to be binding must be based on legal principles. Legal principles shape the content of legal norms formulated in legal regulations. Without understanding legal principles, it is impossible to understand the essence of law. Therefore, to understand a nation's law, it is necessary to explore its legal principles. The issuance of land title certificates over maritime areas has given rise to conflicts of authority between various government institutions. The Ombudsman of the Republic of Indonesia highlighted the potential for malpractice in the issuance of Building Use Rights Certificates in maritime areas that should not be considered private property. Issuing land title certificates in maritime areas has the potential to violate the law and create conflicts of interest. WALHI is investigating indications of affiliation between companies that obtain Land Title Certificates and large property development corporations, which could lead to the privatization of marine space and threaten sustainability. ecosystems and the livelihoods of coastal communities. The objectives of this study include finding answers and developing previous research regarding the granting of building use rights where the issuance of certificates does not correspond to the nature and purpose of the granting of rights in relation to the principle of the social function of land rights; In this research, the researcher used a normative juridical data analysis method, Regarding the issuance of building use rights certificates in the waters of Tangerang and Bekasi related to illegal sea fences, this problem is suspected to reflect a lack of synchronization between land and maritime regulations. This is because land regulations in Article 65 paragraph (2) of Government Regulation No. 18/2021 allow the granting of land rights in waters for certain activities, such as the construction of ports or other facilities. However, regulations in the maritime sector do not explicitly regulate this. The Ministry of Maritime Affairs and Fisheries emphasized that the installation of sea fences is unlawful and disrupts the activities of thousands of fishermen. The issuance of land rights certificates above maritime areas has given rise to conflicts of authority between various government agencies. Cross-agency collaboration is needed to address this issue and ensure that administrative procedures are carried out in accordance with applicable laws and regulations]]>
