Collaborative work on increasingly complex hydroclimatic investigations often crosses disciplinary boundaries.Elements of scientific inquiry,such as data or the results of analyses can become objectified,or capable of being adopted and/or adapted by users from multiple disciplinary realms.These objects often provide a bridge for collaborative endeavors,or are used as tools by individuals pursuing multi-disciplinary work.Boundary object terminology was first formalized and applied by social scientists.However,few examples of the application of this useful framework are found in the hydrologic literature.The construct is applied here to identify and discuss how common research products and processes are used both intally and extally through providing examples from a project examining the historical and paleo proxy-based hydroclimatology of a headwaters region of Mongolia.The boundary object concept is valuable to consider when conducting and critiquing basic research,collaborating across multiple disciplinary teams as when studying climate change issues,as an individual researcher working in a cross boundary sense using methods from differing disciplines to answer questions,and/or when one group adapts the work of another to their own research problems or interpretive needs,as occurred with selected products of this project.