Madrid contributes to the Global Platform for Sustainable Cities (GPSC) through knowledge sharing on urban nature and climate adaptation. The city showcased its experience during the GPSC Webinar Series: Bringing Nature to Cities, highlighting the transformative Madrid Río project—a major river restoration initiative that replaced highway infrastructure with a continuous green corridor along the Manzanares River. By reintroducing natural flows, expanding public space, and creating extensive tree canopy and biodiversity habitats, Madrid Río has become a flagship example of how nature-based solutions can cool cities, improve mobility, and enhance urban livability. Madrid’s leadership provides valuable insights for GEF SCIP cities seeking to integrate river restoration and green infrastructure into metropolitan planning.