The linkage of data beyond disciplinary boundaries is essential for marine research. Sufficient national and international data infrastructures are fundamental for central and easy access to the variety of existing, but distributed datasets in marine science. The Marine Network for Integrated Data Access (MaNIDA) provides a national networked approach in accessing and mining of federated marine research data infrastructures together with data management strategies and data workflows. In that course the MaNIDA consortium conceptualized and developed the “Data Portal German Marine Research” for coherent discovery, view, download and dissemination of scientific data and publications. The data portal is based on a central harvesting and interfacing approach by connecting distributed data sources. Here we inform about the specific details of the portal in terms of content, functionality, services, architecture, interfaces, standards and the contributing data providers.