Interreg is one of the key instruments of the European Union (EU) supporting cooperation across borders through project funding. Its aim is to jointly tackle common challenges and find shared solutions in fields such as health, environment, research, education, transport, sustainable energy and more.Interreg contributes around EUR 1 billion to EU external border cooperation programmes supported by the Instrument for Pre-Accession Assistance (IPA) and the European Neighbourhood Instrument (ENI).