Nature Park Papuk covers the largest part of the mountain Papuk, and partially of Krndija in the general direction northwest – southeast. It covers an area of 336 km2 (33 600 hectares). Almost 95% of the Park’s surface is covered with forests which are under special protection in some sites due to their scientific and landscape value.
The Nature Park Papuk is protected because of its extremely valuable biological, geological, landscape and historical features and includes almost the entire area of the Mountain Papuk and western part of the Mountain Krndija. From geological perspective, the Park is significant for its abundance of almost all types of rocks from Palaeozoic to Quaternary, as well as for the great diversity of rocks, minerals, fossils, geological structures and textures, karsts phenomena and objects. The north-western part of the Park includes the site Rupnica – the first geological nature monument in Croatia – protected because of the step-like discharge of volcanic rocks and representing a unique geological phenomenon in our country.