The main purpose of the park is to protect the unspoiled Una river and its tributaries Krka and Unac, which run through it.

The Una forms a number of calcareous sinter banks and cascades near Martin Brod, including around the Milančetov buk waterfall.

[3] A popular "International Una Regatta" kayaking competition begins at Martin Brod, and the waterfall of Štrbački Buk is found further downstream.

Area of the park has rich cultural-historic heritage and numerous archaeological sites, many dating from the prehistoric period.

Significant historical and cultural heritage of the area within and outside the park zone are the Roman fort Milančeva Kula, Rmanj Monastery, medieval fortress Ostrovica above Kulen Vakuf, as well as outside the park zone Sokolačka Kula fortress in Sokolac village near Bihać and Ostrožac Castle between Bihać and Bosanska Krupa.