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The Grande de Tárcoles River in Costa Rica is one of the most polluted and degraded river basins in Central America. At the same time Costa Rica is a country internationally recognized for progressive environmental management. At least on paper, the country fosters sustainable river management in the form of integrated water resources management (IWRM). In the specific case of the Grande de Tárcoles River there is the General Integral Commission of the Grande Tárcoles River basin (CGICRGT) assigned to manage the basin in an integral manner. How this works in practice has so far not been investigated. Therefore, in this article we examine the formal and informal design and working practices of the CGICRGT and determine which type of river basin organization (RBO) it represents. Based on a mixed-method approach combining document analysis with semi-structured qualitative interviews we found that the CGICRGT contains elements of both, an agency RBO and a coordinating RBO. Although coordinating the river management works well to a certain extent, critical challenges remain that hinder a fully successful management of the basin and in consequence the improvement of its ecological status. Amongst them count the overlapping responsibilities of national and local institutions, the missing participation of some important institutions, the lack of financial and personnel resources, slow progress in terms of time, and a lack of motivation of the participating institutions. Although the CGICRGT presents an excellent platform for the integrated management of the Tárcoles river basin its progress will be too slow and its impact too small as long as all participants do not prioritize its work and integrate and motivate all important actors. [ABSTRACT FROM AUTHOR]

Co-design processes are of key importance in planning and implementing Nature-based Solutions (NBS), but require boundary management between diverse holders of local, practical and scientific knowledge. Participatory and map-based planning tools, such as Geodesign workshops, can facilitate such boundary management through mobilising knowledge holders, and translating and negotiating between different perspectives. The COVID-19 pandemic hindered physical mobility, but offered an, albeit unintended, opportunity to explore new ways of virtual mobility for facilitating boundary management in NBS co-design through digital participatory tools. This short communication aims to demonstrate how a spatial planning process for NBS can be facilitated in an online context. We draw on an international case study for co-designing NBS in Costa Rica, conducted during the severe lock-down restriction of the COVID-19 pandemic. This novel approach showcases how physical presence and movement is replaced by virtual mobility enabled through an online geographic map-based environment that allowed participants to communicate their opinions and co-create local and regional NBS actions. The case study included developing and testing a co-design tool to understand and map local perceptions of social-ecological problems, and an actual co-design process for siting NBS options and jointly exploring their implications. We present two levels of the process: 1) the adaptation of the co-design tool, and 2) the use and usefulness of the co-design tool. Our evaluation shows that the tool served its purpose well and provided useful support to local stakeholders. We recommend to test further strategical combinations of in-person and virtual methods in NBS co-design processes to improve NBS planning and implementation., Competing Interests: Declaration of competing interest The authors have no conflict of interest to declare., (Copyright © 2023 Elsevier B.V. All rights reserved.)