The nature reserve Černé a Čertovo Jezero (Black and Devil's Lakes) lies on the slope of Jezerní Hora (Lake Mount - 1,343 m) about 4 km north-east of the town Železná Ruda.

It was founded in 1911 to protect two of five morainic lakes in the Czech part of the Šumava mountains (Bohemian Forest) - Černé Jezero (Black Lake) and Čertovo Jezero (Devil's Lake). The interesting fact is, that the main European watershed leads between both lakes - Černé Jezero belongs to the river basin of the Vltava river, which takes water into the Elbe river and then into the North Sea, Čertovo Jezero lies in the basin of the Danube river, which empties into the Black Sea.

The area of the reserve is 175 ha. The rock faces above both lakes are the only places where avalanches can appear in the Šumava mountains.
The lakes and flora and fauna are protected here. This is a habitat of some rare animals and plants.