The document outlines the Horizon 2020 topic SCC-02-2016-2017, focusing on innovative nature-based solutions for cities, with aims to develop, deploy and assess these solutions through co-designed projects involving multiple stakeholders. It details methodologies for mapping relevant research projects and key research institutes, as well as identifies major participating institutions and networks in water research. The call encourages participation from a diverse range of disciplines, including environmental science, social sciences, and local authorities, with a budget of 40 million euros and specified deadlines.