Klič, Mountain summit in North Bohemia, Czech Republic.

Kleis, known in Czech as Klíč, is a mountain summit in the Lusatian Mountains in North Bohemia, Czech Republic, rising to about 760 meters (2,490 feet). The peak stands above dense forests that cover most of the surrounding slopes and can be seen from many points in the wider region.

The mountain has carried both its Czech name Klíč and its German name Kleis for centuries, reflecting the long coexistence of Czech and German-speaking communities in this border region. After the Second World War, the German-speaking population was expelled, but both names have remained in use to this day.

The name Klíč probably comes from the Old Slavic word kljuš, meaning a place where water springs up; older maps use the German name Kleis. Since 1962 the SK Nový Bor hiking section has held a winter camping event named Zimní stanování na Klíči, moved off the summit after its 20th year to protect the reserve, with the 60th edition in 2021 at Svor.

Several marked hiking trails lead to the summit from different directions, so it is worth checking which starting point suits your route best before setting out. Parking is available at the main access points, and the trails are generally well signed throughout.

The Kleisquelle spring just below the summit, now called Kamzičí studánka (Chamois Spring), supplies drinking water to Nový Bor. Chamois released after 1900 by the Kinský owners of the Sloup estate still live on the scree cone beneath the rock face and near the top.