Cerné jezero is the deepest and the largest natural lake in the Czech Republic. It is located in the wild and beautiful Bohemian Forest. The lake is located very close to the German border, and during the Cold War, this area was used by communist secret services in Operation Neptune in 1964. Locals still share interesting stories related to this period. The Czechoslovak StB in collaboration with the Soviet KGB covertly sank cases containing old captured Nazi SS RSHA documents. Now the lake is a peaceful area connected with Uhlava River. Across the ?erné jezero runs the main European water divide and it thence he the Black Sea. The lake serves as the reservoir.
