MERLIN is a EU Horizon 2020 Innovation Action implementing nature-based solutions (NbS) to help deliver the environmental, societal and economic goals of the European Green Deal. Led by University of Duisburg Essen, the project brings together 47 partners from across Europe, including universities, research institutes and nature conservation organisations, as well as stakeholders for businesses, governments and municipalities. The project demonstrates the impacts of implementing NbS through 18 large-scale freshwater and wetland restoration projects across Europe. The project includes investments of 10 million Euro in practical measures to scale-up restoration measures at these demonstration sites. The project started 1st October 2021 and runs for 4.5 years until 30th March 2026.