Atanasovsko lake is part of the Burgas lake complex and to the east it borders with the Atanasovskaya spit, which is about 1 km long sand spit with the Black Sea. The lake is coastal and has rich flora and fauna, some of which is protected by the Biodiversity Act and is globally threatened. Atanasovsko lake is connected to the Black Sea by numerous canals through which it drains. For the protection of rare and endangered nesting migratory and wintering birds in the country and in Europe, the maintained Lake Atanasovsko Reserve was created.