In a new paper* coming out in the April 2025 issue of the Journal of Archaeological Science: Reports, Ateneo de Manila University researchers Riczar Fuentes and Alfred Pawlik challenge the widely-held contention that technological progress during the Paleolithic only emerged in Europe and Africa.
They point out that much of ISEA was never connected to mainland Asia, neither by land bridges nor by ice sheets, yet it has yielded evidence of early human habitation. Exactly how these peoples achieved such daring ocean crossings is an enduring mystery, as organic materials like wood and fiber used for boats rarely survive in the archaeological record. But archaeological sites in the Philippines, Indonesia, and Timor-Leste are now providing strong evidence that ancient seafarers had a technological sophistication comparable to much later civilizations.
Microscopic analysis of stone tools excavated at these sites, dating as far back as some 40,000 years ago, showed clear traces of plant processing—particularly the extraction of fibers necessary for making ropes, nets, and bindings essential for boatbuilding and open-sea fishing. Archaeological sites in Mindoro and Timor-Leste also yielded the remains of deep ocean fish such as tuna and sharks as well as fishing implements such as fishing hooks, gorges, and net weights.
“The remains of large predatory pelagic fish in these sites indicate the capacity for advanced seafaring and knowledge of the seasonality and migration routes of those fish species,” the researchers said in their paper. Meanwhile, the discovery of fishing implements “indicates the need for strong and well-crafted cordage for ropes and fishing lines to catch the marine fauna.”
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This body of evidence points to the likelihood that these ancient seafarers built sophisticated boats out of organic composite materials held together with plant-based ropes and also used the same rope technology for open-sea fishing. If so, then prehistoric migrations across ISEA were not undertaken by mere passive sea drifters on flimsy bamboo rafts but by highly skilled navigators equipped with the knowledge and technology to travel vast distances and to remote islands over deep waters.
Several years of fieldwork in Ilin Island, Occidental Mindoro, inspired the researchers to think of this topic and to test this hypothesis. Together with naval architects from the University of Cebu, they recently started the First Long-Distance Open-Sea Watercrafts (FLOW) Project, supported by a research grant from the Ateneo de Manila University, with the aim of testing raw materials that were probably used in the past, and to design and test scaled-down seacraft models.
The presence of such advanced maritime technology in prehistoric ISEA highlights the ingenuity of early Philippine peoples and their neighbors, whose boat-building knowledge likely made the region a center for technological innovations tens of thousands of years ago and laid the foundations for the maritime traditions that still thrive in the region today.
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New archaeological evidence suggests that ancient inhabitants of the Philippines and Island Southeast Asia had the advanced plant-working technology needed for sophisticated boat building and open-sea fishing. Alfred Pawlik
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Evidence of plant-working technology in ancient human habitations across Island Southeast Asia suggests that the prehistoric peoples of the Philippines and their neighbors possessed both sophisticated seacraft and advanced nautical skills. Riczar Fuentes and Alfred Pawlik, CC BY-NC
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Article Source: Ateneo de Manila University news release.
*Testing the waters: Plant working and seafaring in Pleistocene Wallacea, Journal of Archaeological Science Reports, 10.1016/j.jasrep.2025.105020
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