Seventy-one percent of the planet Earth is ocean. With increased efforts in fishing, energy extraction, energy generation, shipping, and proposed mining activity, ocean and coastal areas are under increasing pressure from even more intensive use and development. This Nutshell, now in its 6th Edition, provides short summaries of state, U.S. national, and international law and policy relevant to practitioners and academics interested in the field of ocean and coastal law. The most recent edition, updating legal developments from previous editions, also offers new material on the recent biodiversity beyond national jurisdiction treaty, marine renewable energy (green hydrogen and offshore wind), current beach access controversies, coastline adaptation to sea-level rise, climate change policies for ocean protection, and cultural heritage law.