Krasnohorska Cave is a karst cave situated at the northern foot of the Silicka planina Plain, in the Slovak Karst, 6.5 km southeast of Roznava, in Slovakia. With unique natural decorations of bizarre shapes and unusual structure composed almost entirely of calcium, it is currently listed by the Guinness Book of Records as the cave containing the largest stalagmite in existence, generally accepted as being about 12 m in diameter and 32.7 m in height. It grows significantly in volume every year as the incessant drips solidify.
The length of the cave is 1350 to 1450 metres and it represents the end of the cave system underground stream Buzgo.
Part of the cave from the entrance to the Hall of Giants is formed in dolomite and dolomitic limestones with impressive limestone layers. The back parts of the cave like the Pearl Passage, the Great Hall and the Mirror Hall, are located in pure limestones areas. The Great Canyon passageway was formed as a result of tectonic faults which also helped shape large chambers in the back part of the cave, discovered by Roznava cavers in 1964. Like the other caves in the Slovak Karst zone, it is on the UNESCO List of the World Natural Heritage.