That is why Croatian mountaineers regard this area as the most precious jewel among all of the Croatia’s mountains. Hajdučki kukovi and Rožanski kukovi, an endless range of rocky peaks with diverse and bizarre forms (the meaning of kukovi is hips) of up to 200 metres high, are situated in the very centre of the national park. This amazing rocky landscape is protected as a strictly regulated reserve, the strictest form of the nature protection in the country. Located amid Hajdučki kukovi, at an altitude of 1,475 metres, is Lukina jama. With its base being a mere 83 metres above the sea level, its overall depth of 1,392 metres makes it the eighth deepest pothole in the world. Despite the harsh and hostile rock bound wilderness, in the 1930s a trail was masterfully built through the Rožanski kukovi by an engineer Ante Premužić, a dedicated lover of Velebit after whom the trail was named. The Premužić trail is considered to be the most beautiful hiking trail in Croatia. It is also known as the one that offers, even to those of modest physical condition, an opportunity to walk safely along the edges of massive cliffs and precipitous abysses. From the trail one can enjoy wonderful views of the sea and the Kvarner islands.