Tracing Taonga Trajectories: A Methodological Framework for Indigenous Heritage Mapping.

Rangitāhua is a tupuna to Ngāti Kuri and represents the iwi's geographic and ancestral connection to the Pacific. Despite this millennium-long ancestral tie, Ngāti Kuri's access to Rangitāhua has been severed for two centuries. Meanwhile, many European expeditions visited the islands, extracting and distributing natural history taonga across institutions, mostly in the Northern Hemisphere. In this context of disconnection, Ngāti Kuri engaged partners to reclaim research leadership over Rangitāhua, leading to the Indigenous-led Te Mana o Rangitāhua program, embedding Māori values and tikanga within the environmental wellbeing research project. This study is part of the program and documents our collaborative approach to identifying expeditions to Rangitāhua, mapping where their taonga and data are held worldwide, and examining institutional responses to our data requests. We identified 127 expeditions that distributed 1.73 million objects across 88 institutions. Our provenance mapping successfully cross-linked specimens to the expeditions that collected them and the institutions that house them today. However, our research also revealed ongoing institutional barriers to data access, emphasizing colonial gatekeeping practices embedded in contemporary museology systems. We stress the urgent need for accessible and reciprocal data request systems if museum practitioners hope to advance the ultimate goal of Indigenous data sovereignty.