The REGINA-MSP project is a two-year project (2023-2024) that aims to greater integrate the regional and sub-regional needs, perspectives and stakeholders in the development and implementation of national Maritime Spatial Planning (MSP). A specific task of REGINA-MSP (task T4.3) was dedicated to the topic of Communities of Practice (CoP) as a way to enhance knowledge sharing among regional authorities and experts to improve the integration of regional and local views and stakeholders in MSP.