From Vratnik (via Otocac) the road leads to the Plitvice National Park, which is located in the wooded hills between the mountains Mala Kapela and Pljesivica. The Plitvice lakes consist of 16 lakes, joined together like a series of steps. The ﬁrst lake is at 636 m above sea level, and the last is 133 m lower. They are linked by waterfalls and cascades. The lakes mainly lie in a south- north direction, are 8 km long and cover an area of 1.92 km2. The deepest lake is 46 m deep. They are divided into two groups: the Upper (12 lakes), formed of dolomite rock, which are broad and surrounded by a peaceful landscape; and the Lower (4 lakes) formed from limestone. These are smaller and lie beneath 70 m high rock cliffs. The clarity of the water in the lakes is also a phenomenon. This depends on the density of the plankton, and in the largest lake, Kozjak, one can see up to 8.2 m. The Plitvice lakes have been registered by UNESCO as part of the world’s natural heritage.