Introduction

The European Union’s cohesion policy aims to “reduce economic, social and territorial disparities between regions.” It is based on three major funds: the European Regional Development Fund (ERDF), the European Social Fund Plus (ESF+) and the Cohesion Fund. Among its priorities is “European territorial cooperation,” whose main instrument is the Interreg program.

Launched in 1990, Interreg supports cooperation between border regions to promote harmonious and sustainable development. It is based on several strands: cross-border cooperation (Interreg A), transnational cooperation (Interreg B), and interregional cooperation (Interreg C). For the 2021-2027 period, Interreg has a budget of around 8 billion euros, strengthening the resilience of territories in the face of climate and digital challenges.

Cross-border cooperation concerns NUTS 3 level regions located along inland borders. European Union regions located along maritime borders must be separated by a maximum distance of 150 km to be eligible.