The Hanging Coffins at Sagada, PC: Palu Malerba
According to the study published in Nature Communications titled Exploration of hanging coffin customs and the Bo people in China through comparative genomics , researchers extracted and sequenced ancient genetic material from 11 individuals recovered from four separate hanging coffin sites in China, with some remains dated to more than 2,000 years old. The team compared this ancient genetic data against DNA collected from 30 living individuals of confirmed Bo descent, allowing them to test directly whether a genetic connection existed between the ancient coffin burials and this specific present-day community. Scattered across remote cliff faces in southern China, wooden coffins have hung suspended for centuries, wedged into rock crevices or resting on driven wooden stakes hundreds of feet above the ground. Who built them, and why they chose height over a conventional grave, remained an open question for generations of archaeologists. The results showed a clear genetic link between the ancient hanging coffin individuals and modern Bo populations, providing what the study’s authors describe as strong evidence that the Bo people are direct descendants of the community that originally practised this cliffside burial tradition. The finding effectively confirms what local oral tradition and some historical records had already suggested: that the Bo people were not simply associated with the hanging coffins, but were the community responsible for creating them.
A new ancient DNA study, published in the journal Nature Communications, has now traced a direct genetic line between individuals buried in these hanging coffins and the modern Bo people, a small ethnic community that still lives in China’s Yunnan province today.
Why this points to a much older, broader population history
Researchers also analysed DNA from four individuals recovered from log coffins found inside a cave in northwestern Thailand, the oldest of which dated back approximately 2,300 years. The individuals connected to the hanging coffin tradition shared ancestry with populations that inhabited southern China and Southeast Asia during the Neolithic period, a broad stretch of prehistory running from roughly 10,000 BCE to 2000 BCE, according to the study. Researchers estimate the tradition ultimately ended sometime during the Ming dynasty, which ran from 1368 to 1644, after which the practice largely disappears from the historical record.
The custom was already documented during China’s Yuan dynasty, with one historical source specifically describing coffins placed high above the ground as an auspicious sign, reflecting a belief that greater height brought better fortune to the deceased in the afterlife, according to references in historical texts. The research extended beyond China’s borders to test how isolated this burial tradition actually was. These Thai burials used a related but distinct method, cutting a tree trunk in half, hollowing out one section to hold the body, and using the other half as a cover, before placing the finished coffin inside a cave, sometimes elevated on a wooden platform or natural rock ledge. Historical evidence indicates the practice persisted for well over a thousand years before fading out. Administratively, they are classified as part of the broader Yi ethnic group, though the Bo maintain their own distinct language and cultural traditions separate from other Yi communities. For a group whose specific historical origins had remained genuinely uncertain, this genetic evidence provides a considerably clearer place in the historical record, connecting a visually striking and long mysterious burial tradition to a living community rather than treating the hanging coffin builders as a vanished, disconnected culture.
Researchers found genetic similarities linking the hanging coffin remains to other ancient populations across the wider region, populations the study associates with early Tai-Kadai-speaking peoples, a language family that once covered large areas of southern China before the later expansion of Han Chinese populations across the region. A few thousand people identifying as Bo descendants continue to live in Yunnan province today.