Indigenous maritime migrations reveal 40,000-year-old Philippine island networks: systemic adaptation to rising seas and ecological shifts

Indigenous Philippine communities, such as the Sama-Bajau and Tagbanua, possess living maritime knowledge systems that align with archaeological findings, including seasonal migration routes and sustainable fishing practices. These networks were not merely survival strategies but cultural frameworks where navigation, trade, and kinship were interwoven. Modern archaeology often treats Indigenous knowledge as supplementary rather than foundational, despite its role in preserving these systems through oral traditions and adaptive practices.

The Philippine maritime networks mirror broader Austronesian expansion patterns, where rising post-glacial sea levels (12,000–6,000 years ago) forced coastal adaptations and inter-island voyaging. Similar systems existed in the Caribbean (Taíno *canoa* networks) and the Mediterranean (Phoenician trade routes), suggesting a global pattern of Indigenous maritime resilience. Colonial narratives later framed these as 'discoveries' to justify territorial claims, erasing Indigenous agency in shaping these landscapes.

Comparative studies of Indigenous maritime cultures reveal shared principles: reliance on celestial navigation, ecological calendars tied to marine cycles, and communal governance of coastal resources. In Micronesia, the *stick charts* of the Marshallese encode wave patterns and island locations, while in the Philippines, the *balangay* boats symbolize both transportation and cultural identity. These systems demonstrate how maritime mobility was not just a technological feat but a spiritual and social practice.

Archaeological evidence, including submerged sites and shell middens, supports the existence of early Philippine maritime networks, with dating methods (e.g., radiocarbon, luminescence) confirming occupation dates. Genetic studies of Philippine populations show continuity with these ancient migrations, though climate modeling suggests sea-level fluctuations played a key role in shaping settlement patterns. However, Western scientific frameworks often prioritize material artifacts over intangible knowledge, limiting holistic understanding.

Indigenous Philippine epics like the *Hinilawod* and *Darangen* encode maritime journeys as spiritual quests, where heroes navigate not just physical waters but metaphysical realms. Art forms such as the *t'nalak* weaving of the T'boli people depict oceanic motifs, symbolizing the interconnectedness of land and sea. These artistic expressions reflect a worldview where maritime knowledge is sacred, contrasting with Western secularized narratives of exploration.

Climate projections for the Philippines (e.g., 1–2m sea-level rise by 2100) suggest that early human adaptations to rising seas offer critical lessons for modern coastal resilience. Scenario planning could integrate Indigenous knowledge with modern technology, such as combining *balangay*-inspired boat designs with renewable energy for sustainable fishing. However, current policies often prioritize hard infrastructure (e.g., seawalls) over adaptive, community-led strategies.

Indigenous Philippine scholars and communities, including the Lumad and Moro peoples, have long documented these maritime traditions but are rarely cited in mainstream archaeological narratives. Women, who often held key roles in navigation and resource management, are systematically excluded from historical accounts. The erasure of these voices reflects broader patterns of epistemic violence in academia, where Indigenous knowledge is treated as anecdotal rather than empirical.