Sjeverni Velebit (Northern Velebit) was proclaimed a national park for its wealth and diversity of karst forms, flora, fauna and landscapes located within a small area.
This area already hosted four areas under special protection – strict nature reserve "Hajdučki i Rožanski kukovi", botanic reserve "Visibaba", the finding site of the endemic plant Croatian Sibirea, and botanic reserve Zavižan-Balinovac-Zavižanska kosa, inside which there is also the park architecture monument Velebitski botanički vrt (Velebit Botanical Garden).
The Park is a part of the International Biosphere Reserve.
Large and preserved forests are suitable habitat for large carnivores – bear, wolf and lynx. Their presence in the same area shows the preservation of the ecosystem. Man made an extensive impact on the landscape of Northern Velebit. With the creation of new habitats – pastures, ponds and dry stone walls – man enabled the survival of many plant and animal species and contributed to its biological diversity.