The National Park is a woody mountain area (mid-highland with the character of lower highland up to a higher mountainous landscape) of the flysch zones of the Carpathians, partly influenced by a traditional economical human activity. Forests consist predominantly of deciduous wood plants of mild belt (prevails the European Beech – Fagus silvatica L.).

The National Nature Reserve aims at protecting the natural environment, flora and biocenosis which are the examples of European natural ecosystems. It is the preserved fragment of the Carpathian natural forest (virgin forest) as a unique example of the forest ecosystem in the climax stage of fir-beech altitudinal zone.