Situated in the
Demanovska valley, on the northern side of the Low
Tatras, in the National Nature Reserve Demanovska Valley,
in the territory of the Low Tatras National Park. It was
formed in the Middle Triassic limestones by the ponor
flow of Demanovka at four developmental levels, into
which steep passages modelled by lateral tributaries
infall. The cave length is 8,126 m. Sinter „water-lilies"
and other lacustrine forms, as well as eccentric
stalactites are unique among phenomena of sinter filling.
Mighty sinter waterfalls and stalagnates, sphaerolithic
stalactites and many other diverse forms of stalactites
and stalagmites are captivating. The cave was discovered
through a dry ponor of Demanovka in 1921. A part of the
cave has been open to the public since 1921, upper parts
since 1933. The length of publicly accessible section is
1,800 m. From 1993 to 1998 the cave was serving for
speleotherapeutical procedures.