Interreg
Interreg is a series of programmes to stimulate cooperation between regions in and out of the European Union (EU), funded by the European Regional Development Fund. The first Interreg started in 1989. Interreg IV covered the period 2007–2013. Interreg V (2014–2020) covers all 27 EU member states, the EFTA countries (Norway, Switzerland, Iceland, Liechtenstein), six accession countries and 18 neighbouring countries. It has a budget of EUR 10.1 billion, which represents 2.8% of the total of the European Cohesion Policy budget. Since the non EU countries don't pay EU membership fee, they contribute directly to Interreg, not through ERDF.
Interreg VI covers the 2021-2027 period, and was allocated almost EUR 10 billion. This evolution of Interreg includes a reinforced cooperation with partner countries with Interreg IPA, Interreg NEXT and the integration of a dedicated strand for cooperation between the EU outermost regions and their neighbouring regions outside the European Union.