Hajdučki i Rožanski kukovi, Nature reserve in Lika-Senj County, Croatia.

Hajdučki i Rožanski kukovi is a strict nature reserve in Lika-Senj County, Croatia, made up of tall limestone peaks separated by deep cracks and rocky gorges. The terrain is raw and open, with bare rock dominating the landscape and very little soil or vegetation between the formations.

Hajdučki i Rožanski kukovi were declared a strict nature reserve on 22 January 1969, within the Northern Velebit National Park. On 7 July 2017 they were inscribed on the UNESCO World Heritage list as part of the Primeval Beech Forests of the Carpathians and Other Regions of Europe, a joint listing of 13 countries, covering 1,289 hectares of beech forest. The peaks carry newer names because the original ones were forgotten as the local population died out.

The peaks carry newer names because the original ones were forgotten as the local population died out. The Rožanski group is the larger and more accessible of the two, crossed by the Premužić Trail, with a mountain shelter in its middle section. The two groups are separated by the Lubenovačka vrata pass.

Access to the reserve is along marked mountain trails, and visitors should come prepared for uneven, slippery rock surfaces and rapidly changing weather. Mountain shelters in the area can serve as rest or overnight stops for those planning longer routes.

Below the rock formations lies Lukina jama, one of the deepest known vertical shafts in the world, still being explored by cavers. The limestone visible on the surface and the cave network beneath it are part of the same geological process that shaped this entire area over millions of years.