The publication is dedicated to the historical natural object - the Black Sea and the surrounding countries. At the same time, the Sea of ​ ​ Azov is also being considered. In this region, many geopolitical, economic, social and environmental problems are focused not only adjacent to the Black and Azov Seas of countries, but also other states of the world. The encyclopedia contains more than 2000 articles on geographical objects, cities, ports, transport communications, aquatic biological resources, international agreements, national and international programs, research institutions, historical and archaeological monuments, the activities of outstanding scientists, researchers, travelers, military leaders and entrepreneurs related to the Black Sea-Azov theme