The Plitvice Lakes National Park is a particular geological and hydrogeological karst phenomenon. The Plitvice Lakes Complex was proclaimed a national park on April 8, 1949.

It is the largest, oldest and most visited Croatian national park. It represents a wooded mountain area with 16 lakes of different sizes, filled with crystal blue water.

The National Park consists of 16 lakes, which gradually descend and descend to each other in a series of 5460m airliners. Lakes are divided into Upper and Lower Lakes. The upper lakes are: Prošćansko jezero, Ciginovac, Okrug, Batinovac, Veliko jezero, Small lake, Vir, Galovac, Milino lake, Gradinsko jezero, Veliki Burget and Kozjak. The lower lakes are: Milanovac, Gavanovac, Kaluđerovac and Novaković Brod.

The lakes flood the Black and White River from the tributary, and the Rječici and its tributaries. There are many sources where water is abundant. These are typical karst springs that have been created on the defects of permeable and impermeable geological formations.

The largest lake is Kozjak with 81.5 hectares of land, and the deepest with 47 m. Prošćansko jezero is the second largest and extends from the south to the north in the length of 2.5 km.

Spacious forest complexes, exceptional natural beauty of lakes and waterfalls, rich flora and fauna, mountain air, contrasts of autumn colors, forest paths and wooden bridges, and much more are part of the unmistakable universe that UNESCO declared as a world heritage site in 1979 amongst the first in the world. The park is divided into the narrow and broader zone according to the degree of protection. It is located in the area of ​​two counties, 91% of the park is in Lika-Senj County and 9% in Karlovac County.

In the Plitvice Lakes there is also the source of the river Korana, which is fed with water from the lake. The climate in the national park is moderate mountain.

One of the most beautiful waterfalls in Plitvice - the waterfall between Milanovac and Gavanovac is called "Milka Trnina" slap on Croatian opera primadona.