In the face of current environmental challenges, the article analyzes the interrelated processes of commoning and b/ordering in relation to transboundary environmental commons. The author suggests a multi-scalar approach to the governance of transboundary resources and points to power relations, distribution conflicts and questions of costs and benefits for different stakeholders at intersecting scales. She emphasizes that borders are not static (geo)political configurations but administrative categories that change in relation to commoning practices performed by transboundary communities of commoning.