Among the most renowned and significant speleological structures are the Cerovac Caves , located in the southern part of "Velebit Nature Park ". This 3-tier complex (Lower Cave , Middle Cave and Upper Cave ) features a total of 4 km of explored channels. The first 700 m of the Lower and Upper Caves have been prepared for tourist visits. These caves abound in traces from the distant past. In addition to large quantities of archaeological findings, they are also among the largest discovery sites of the cave bear in Croatia . One may easily spot claw marks gorged into the cave walls as the bears moved against them. Water has worked for thousands of years to create dripstones. It is therefore vital to treat these cave ornaments with care and not touch them, as just a single careless move may put an end to a process that has been going on for decades.
The temperature in the caves is between 5o C and 11o C - warmer clothing, a head cover, and comfortable shoes are recommended.