Černá Studnice, Mountain summit in Jizera Mountains, Czech Republic

Schwarzbrunnberg, known in Czech as Černá studnice, is the highest summit of the Černostudniční hřeben ridge in the Jizera Mountains at 869 m. Its granite, locally called "dvojslídná tanvaldská", forms scattered boulders and crags such as Kladívko, Čertova hlavička and Černostudniční věž. A 26 m stone lookout tower of granite blocks, 1.6 m thick at the base, stands on the top reached by 91 steps.

In 1885 the Liberec German Mountain Association fitted the two summit rocks with a platform and railing, its first construction project. After Jablonec tourists split from that association in 1903, architect Robert Hemmrich won the competition for a stone lookout tower, opened on 14 August 1905 before some six thousand visitors.

The name Schwarzbrunnberg refers to a dark spring on the slope, and the two villages below the peak, Horní and Dolní Černá Studnice, take their names from the mountain. Near the summit stands Veselého kříž, a cross commemorating Václav Veselý of Nová Ves, who shot himself in the nearby woods on 3 July 1969, reportedly out of unhappy love.

The tower is reached by 91 steps and stands on the summit rocks, which were made accessible with a platform and railing in 1885. Marked trails arrive from Jablonec nad Nisou (green), from Smržovka via Berany (blue), and along the ridge on the red-marked Bengler-Weg past Pustina and Muchov to Tanvald.

The granite boulders around the tower carry names such as Kladívko, Čertova hlavička, Černostudniční věž and Buchta, and some are used for climbing. Near the summit path from Horní Černá Studnice stands Veselého kříž, a cross commemorating Václav Veselý of Nová Ves, who shot himself in the nearby woods on 3 July 1969, reportedly over unhappy love.