Knappensee

The Knappensee, also known as the Knappenrode reservoir (German: Speicher Knappenrode; Upper Sorbian: Hórnikečanski jězor), is a lake and residual open-pit mine to the south-east of Hoyerswerda in the state of Saxony, Germany.

The Knappensee is named after the town of Knappenrode to the north and is mainly located in the municipality of Lohsa. The lake was created by two flood events in May and June 1945, which led to the flooding of the Werminghoff lignite opencast mine.