The important characteristic of Velebit is its simple, solid form, stiff cliffs, and the nakedness of seaward side and the wood-covered slopes of the Lika side. The basic geological characteristic of the mountains is karst; flora and fauna are abundant. The whole mountain range is protected as nature park, and the most popular spots on Velebit are: the peak of Vučjak (1,644 m) above Zavižan, the botanical gardens and caves, Hajdučki and Rožanski kukovi, Štirovača, the Northern Velebit National Park and the Paklenica National Park. The Croatian Meteorological and Hydrological Service has a permanent measurement station at Zavižan.