“I'm always entirely happy when I'm here!” Urban blue enhancing human health and well-being in Cologne and Düsseldorf, Germany

► The first study to comprehensively explore the beneficial health outcomes and well-being of urban blue. ► Using an extended therapeutic landscape concept, we observed and questioned users of promenades in city centres. ► Positive health aspects distinctly prevail over negative outcomes. ► Key aspects for health are the physical environment, social relationships, emotional attachment and the possibility to engage in a variety of outdoor activities.