Skopal, NicholasPradier, BaptisteBounxayhip, SouliyaCooper, CharlieDussubieux, LaureDevantier-Thomas, Tate GregoryPilgrim, TraceyVan Berkel, StephDemko, DavidValentin, FrederiqueSkopal, JazminBaker, DanielFlorin, S. AnnaPosth, CosimoClark, Geoffrey2026-06-112026-06-110003-598Xhttps://hdl.handle.net/1885/733810326Hundreds of large stone vessels can be found dispersed across the Xieng Khouang Plateau in northern Laos. Despite nearly a century of research, their purpose remains uncertain. Here, the authors report on the excavation of the exceptionally large Jar 1 at Site 75, which contains a collective mortuary assemblage of secondary interments. The disarticulated remains of at least 37 individuals hint at the jars’ function within a complex funerary sequence, with direct radiocarbon dating indicating a prolonged period of mortuary activity c. cal AD 890–1160, which was a time of increasing regional interaction and mobility in Southeast Asia.enPublisher Copyright: © The Author(s), 2026. Published by Cambridge University Press on behalf of Antiquity Publications Ltd.Laosmegalithmortuary archaeologyradiocarbon datingsecondary intermentSoutheast Asia202610.15184/aqy.2026.10352105039309629