Plitvička jezera (Plitvice lakes), are the most known Croatian national park and are entered in the UNESCO Register of World Natural Heritage.
In the upper parts of the canyon, a larger forest area has been preserved on the littoral side of Velebit. This, in addition to the existence of several vegetation and climate zones from warm Mediterranean to harsh mountain zones on the top of Velebit, largely contributed to it that this area was among the first in Croatia to be proclaimed a national park, first provisionally in 1928, and then definitely in 1949.
Sixteen lakes interconnected with waterfalls created by deposition of travertine, a special kind of limestone, constitute the main attraction of this unique park. The park includes the spring of the Korana River in the area surrounded by dense forests of beech, fir and spruce, partly in the form of primeval virgin forest.
Apart from the lakes and forests, the Park is ornamented with several caves, springs, flower meadows, and is inhabited by brown bear, among other animal species. The popularity of this park is also in the use of special vehicle for transporting visitors (panoramic trains and electric boats), and is conveniently situated at the main road from Zagreb to Dalmatia.