The REGINA-MSP project aims to greater integrate regional and sub- regional needs, perspectives and stakeholders into Maritime Spatial Planning (MSP). The development and access to locally-relevant and up to date data is one important way to better engage regional actors in the elaboration and implementation of MSP action. Through its task 3.2 dedicated to data, the REGINA-MSP project engaged European case study regions to address their diverse data needs, tailored to their unique characteristics, through collaborative efforts. Building on the insights from previous European projects as well as workshops and online meetings conducted as part of the REGINA-MSP project with regional representatives, this report explores the complex data landscape to address regional needs for MSP initiatives. This report also describes the various actions undertaken as part of this task 3.2 and their outcomes, such as the development of a platform for stakeholders to share insights, explore strategies, and identify opportunities for enhancing data accessibility and use in MSP. Presentations and discussions (including an interactive activity on exploring regional conflicts of use) also highlighted initiatives and tools supporting MSP processes, which are further illustrated in this report.