The area was declared a national park due to the exceptional variety of karst phenomena, the diversity of the fauna and the natural beauty found in a relatively small area.
The park covers an area of 109km² and includes the Hajdučki and Rožanski nature reserves, which represent a specific geomorphologic phenomenon where over 150 pits have been discovered to date, the best-known of which is Lukina jama (Luka’s pit), one of the deepest in the world and discovered in 1999.
