Černé jezero

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Černé jezero
Location	near Železná Ruda, Czech Republic
Coordinates	49°10′45″N, 13°10′57″ECoordinates: 49°10′45″N, 13°10′57″E
Lake type	glacial [1]
Primary outflows	Černý potok
Catchment area	1.28 km²
Basin countries	Czech Republic
Max. length	~530 m
Max. width	~350 m
Surface area	18.4 ha [2] [3] [4] [1]
Average depth	15 m
Max. depth	40.6 m [2] [3] [1]
Water volume	2,878,000 m³
Shore length1	~1300 m
Surface elevation	1008 m [3] [1]
References	[1] [2] [3] [4]
1 Shore length is not a well-defined measure.

Černé jezero (literally, Black Lake) in the Bohemian Forest is the largest and deepest natural lake in the Czech Republic ^[4].

This triangular lake surrounded with spruce forest is located about 6 km northwest of Železná Ruda under a 300-metre-high cliff on Jezerní hora (1,343 m) ^[2]. It is of glacial origin, a product of the Würm glaciation. The water in the lake is oligotrophic. There is a natural outflow through Černý potok, a short stream which is a tributary of the Úhlava River. The main European water divide runs across the mountain just above the lake. As a consequence, Černé jezero belongs to the water basin of the Elbe, which finds the North Sea, while Čertovo jezero just 2 km away drains into the Danube and thence the Black Sea.

The oldest pumped-storage hydroelectric plant in the Czech Republic (built 1929-1930) is located here; the lake serves as its upper reservoir.

Due to proximity of the German border (about 1 km), access to the lake was very limited during the Iron Curtain era. This was exploited by communist secret services in Operation Neptune (1964) when the Czechoslovak StB in collaboration with the Soviet KGB covertly sunk cases containing old captured Nazi SS RSHA documents in the lake and subsequently "accidentally discovered" them there.

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