A karst cave below the summit of Slivnica, known as Witches' Cave () was described by Valvasor in his The Glory of the Duchy of Carniola (1689) as a hole where storms were made. Warm air rises from the cave in the cold winter months and condenses to form mist, a phenomenon that contributed to the creation of the local legend about the Slivnica witches, traditionally blamed for all misfortune by local farmers from hail storms to various ailments.