This volume covers multi-disciplinary Research and Development contributions from Europe, Asia and North America on geology, geophysics, bathymetric and biologic aspects, towards data sampling, acquisition, data analysis and its results, and innovative ways of data access. It also presents the development of processes to map, harmonize and integrate marine data across EEZ boundaries, an impressive example of which is the European EMODnet (European Marine Observation and Data network) initiative. EMODnet assembles scattered and partially hidden marine data into continentally harmonized geospatial data products for public benefit and increasingly within overseas collaboration. The volume also aims to shed light on an evaluation of biological and mineral resources and environmental assessments at continental shelf to slope depths. Western Pacific examples provide excellent case studies for this topic. Mapping of the Ocean Realm is not only for scientific purposes, but also for the people who live by the seas. Communication amongst scientists and multiple stakeholders is essential for living sustainably with the seas. In this volume, the editors encourage keeping dialogues amongst all the stakeholders.