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The archipelagic lifeworlds of the Tanjung Binga community on Belitong Island through an interdisciplinary engagement between ecopsychology, maritime anthropology, Indigenous onto-epistemology, and socio-ecological anthropology. Foregrounding sailing traditions as ontological rather than merely technological phenomena, the study investigates how perahu, maritime knowledge systems, and seafaring practices constitute a living relational framework through which the community negotiates ecological existence, cosmological obligation, and intergenerational identity. Data were collected from November 2025 to April 2026 through a mixed-method design combining quantitative instruments — Likert-scale surveys, Occupational Stress Index assessment, and participatory ecological mapping — with deep autoethnography and encompassing in-depth interviews, life histories, affective observation, and systematic documentation of Indigenous stellar navigation, customary ecological calendars, ritual practices, and traditional maritime technologies. Findings indicate moderate psychosocial strain (OSI: 41.50/75), an estimated 450-meter retreat of traditional sea cucumber harvesting zones, and the disappearance of Nyulo Gamat as a maritime livelihood practice — disruptions experienced not solely as economic precarity but as fractures in maritime memory and ecological identity. The article argues that Tanjung Binga sailing traditions constitute an integrated form of archipelagic ecopsychology in which cosmology, ritual practice, territorial ethics, and maritime technology remain mutually constitutive and inseparable from the sea itself.