The document discusses the Atanasov Lake and Bourgas Lake in Bulgaria, highlighting their rich biodiversity, particularly in avian species. Atanasov Lake is home to numerous protected flora and fauna, including endangered birds like the Dalmatian pelican and red-breasted goose, while Bourgas Lake, the largest natural lake in Bulgaria, is affected by pollution and supports many migratory birds. Significant conservation efforts are noted, with several species listed in Bulgaria's red book.