The second volume of this series focuses on analyzing and clarifying the characteristics and typical cultural values of the Northeastern sea, as well as the current status of exploitation and protection of cultural values. Some research contents include: natural, economic, social and population characteristics; overview of 3 study areas of Ha Long Bay, Van Don Island, Cat Ba Island; prehistoric and medieval coastal culture; cultural values in daily life, livelihoods, spirituality and arts related to the sea and island environment; cultural change trends in the North East region before the effects of the development process. Since then, the research team proposed solutions to protect and promote cultural values in this area in the future.