<![CDATA[The construction of a 30.16-kilometer sea fence on the coast of Tangerang Regency has caused legal and social debate because it is suspected that it does not meet the requirements of licensing, spatial planning, and has an impact on the activities of the fishing community. This study aims to analyze the legality of the construction of the Tangerang sea fence based on Indonesia's positive law and the perspective of maqāṣid al-sharī’ah. This research is a normative legal research with legislative, conceptual, and case approaches. Data was obtained through literature studies of laws and regulations, Islamic legal literature, scientific journals, and documents related to coastal area management. The analysis was carried out in a descriptive-analytical manner to assess the suitability of the construction of the sea fence with the principles of legality, environmental protection, and community benefit. The results of the study show that the construction of sea fences in Tangerang has the potential to be contrary to positive law, particularly regarding coastal spatial planning, approval of the use of marine space, and the protection of the rights of fishing communities. From the perspective of maqāṣid al-sharī’ah, the development of coastal areas should be oriented towards the protection of the soul (ḥifẓ al-nafs), the protection of property (ḥifẓ al-māl), and public benefit through environmental maintenance. Development that causes ecological damage, restricts fishermen's access, and lacks community participation is contrary to the principle of lā ḍarar wa lā ḍirār and the principle of dar'u al-mafāsid muqaddam 'alā jalb al-maṣāliḥ.]]>
