Europe's environment is in an alarming state, with climate change expected to further aggravate the situation. This substantially threatens economic prosperity, human wellbeing and social peace. Our society and economy need systemic transformative change, and ecosystem restoration integrated into nature-based solutions lies at its heart. MERLIN (Mainstreaming Ecological Restoration of freshwater-related ecosystems in a Landscape context: Innovation, upscaling and transformation) is a 4-year Innovation Action project (funded by the EU) which aims to support transformative ecosystem restoration. The project will work in 17 flagship projects, from Finland to Israel, in order to generate a blueprint for to implement, upscale and replicate restoration and nature based solutions in freshwater ecosystems.