Černé jezero
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| Černé jezero | |
|---|---|
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| Location | near Železná Ruda, Czech Republic |
| Coordinates | |
| Lake type | glacial |
| 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 |
| Average depth | 15 m |
| Max depth | 40 m |
| Water volume | 2,878,000 m³ |
| Shore length1 | ~1,300 m |
| Surface elevation | 1,008 m |
| 1 Shore length is an imprecise measure which may not be standardized for this article. | |
Černé jezero (literally: Black Lake) in Bohemian Forest is the largest and deepest natural lake in the Czech Republic.
The triangular lake surrounded with spruce forest is located about 6 km northwest of Železná Ruda under 300 metres high cliff of Jezerní hora (1,343 m). It is of glacial origin (a remainder 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. Main European water divide runs just across the mountain above the lake. As a consequence, Černé jezero belongs to water basin of the Elbe (and North Sea), while Čertovo jezero just 2 km away drains into Danube (and 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 German border (about 1 km) the access to the lake was very limited during the Iron Curtain era. This was exploited by communist secret services in Operation Neptune (1964) when Czechoslovak StB in collaboration with Soviet KGB covertly sunk cases containing old captured RSHA documents on bottom of the lake and subsequently "accidentally discovered" them.
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