With MAREGRAPH, we aim at supporting the EU and its Member States in the achievement of ambitious marine-themed objectives by semantically enriching, interlinking and providing high value and foundational datasets. These currently power the “effective biodiversity and conservation knowledge products” of today and will enable building the knowledge products of the future, where knowledge graphs and AI closely interact to support the marine public sector in making and building open knowledge on marine biodiversity. The MAREGRAPH project will provide an open linked data production and publication of three high impact datasets in the marine domain (the World Register of Marine Species (WoRMS), Marine Regions and EurOBIS (the European Node of the international Ocean Biodiversity Information System) using state of the art technologies. This will allow the onboarding of essential marine datasets in the Common European Data Spaces. As such MAREGRAPH will provide a structural component in the digital transition of the marine landscape.