"Governing Arctic Seas: Regional Lessons from the Bering Strait and Barents Sea" is a scholarly book that addresses governance in the Arctic seas. It introduces the concept of ecopolitical regions and provides in-depth analyses of the Bering Strait and the Barents Sea. By integrating natural sciences, social sciences, and indigenous knowledge, it highlights patterns, trends, and processes that serve as a foundation for informed decision-making. The book adopts an international, interdisciplinary, and inclusive approach to analyze governance mechanisms and the associated infrastructure, aiming to achieve sustainability in biophysical regions with shared authority. It is the first volume in a series focused on informed decision-making for sustainability and applies science diplomacy to address transboundary issues. The content is relevant for nations and communities, covering a wide range of urgencies from security challenges to long-term sustainability goals.