In this article we interrogate the recognition of rivers as legal persons in Aotearoa New Zealand (Whanganui River) and Colombia (Río Atrato). Although the legal, political, historical and cultural context for recognition is different in each country, an analysis of the cases presents some interesting conceptual correlations, which help us to understand this emerging (and sometimes controversial) transnational idea that a river can be a person. In both cases recognising that the river is a person is an attempt to accommodate diverse legal and cultural interests in the river, in order to establish a new collaborative relationship between the state and river communities.