This issue of the Working Papers was developed by members of the WATERLATGOBACIT Network’s Thematic Area 4, Transboundary Waters (https://waterlat.org/ thematic-areas/ta4/). The main focus of TA4, as the name suggests, is the politics and management of transboundary waters, which constitute a subject of the highest global relevance. In recent decades there have been intense debates about the potential for conflict and war implicit in the sharing of hydrographic basins between countries, but there are also long-standing research traditions centred on the historical record of cooperation and peace between countries sharing transboundary waters. These and other issues of paramount importance for global water politics and management are the subject matter of TA4’s activities. This is the second issue published by the TA4 Series. It features three articles and a Reflection Note, all of them based on interdisciplinary research projects, including postgraduate research, focused on the multi-level character of the government and management of transboundary waters. Wagner Costa Ribeiro, Co-ordinator of TA4, and Flavia Darre Barbosa, both from the University of Sao Paulo, Brazil, are the editors of this issue.