The phenomenon of sea fences in coastal waters raises legal issues because there are currently no specific regulations governing their status within the Indonesian legal system, even though the utilization of marine space is already regulated by various laws and regulations. This study aims to analyze the legal framework regarding the existence of sea fences within the context of marine spatial planning and coastal zone management in Indonesia, as well as their implications for the rights of coastal communities. The study employs a normative legal research method utilizing statutory and conceptual approaches, analyzing primary, secondary, and tertiary legal materials through a descriptive-qualitative method. The findings indicate that sea fences constitute a form of marine space utilization that must comply with regulations concerning marine spatial planning, coastal zone management, and marine space utilization mechanisms. Although not specifically regulated, the construction of sea fences cannot be undertaken arbitrarily; it must align with spatial plans and applicable regulations. The presence of sea fences—which restrict public access to marine space—conflicts with the principle of state control as stipulated in Article 33, Paragraph (3) of the 1945 Constitution of the Republic of Indonesia and potentially infringes upon the rights of coastal communities to utilize marine space.
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