Ledenika (in Bulgarian Леденика) is a cave in the Northwestern parts of the Balkan Mountains, 16km away from the Bulgarian town of Vratsa, its entrance being at 830m above sea level. The cave is about 300m long and contains ten separate halls. The biggest one is the Concert Hall. The temperature in the cave varies from -7° C to -15° C (in winter in the Antechamber) and to 8° C in the inner parts. The moisture of the air is 92%.
