The CD-ROM contains a recently developed Geographic Information System (GIS) covering the large-scale region of the Black Sea. This system has been created using existing and recently obtained data from a wide range of national and international data sources. Eleven scientific institutions and more than 50 experts have contributed to the development of the Black Sea GIS. We recognize that the quality of the data and its resolution varies between countries and also for the various themes. Still, to our knowledge, this GIS is the first multi disciplinary and comprehensive geographic information system in the Black Sea region. It is our hope that this GIS will useful for scientists and managers, for all friends of the Black Sea, for all those who want to protect and save the Black Sea.