The national park, sometimes known as Plitvice Lakes National Park, is world famous for its lakes arranged in cascades. Currently, 16 lakes can be seen from the surface. These lakes are a result of the confluence of several small rivers and subterranean karst rivers. The lakes are all interconnected and follow the water flow. They are separated by natural dams of travertine, which is deposited by the action of moss, algae, and bacteria.
The lakes are divided into the upper lakes (12) and the lower lakes (4). The highest of these is Prošćansko jezero (639 metres), while the lowest is Novakovića Brod (503 metres). The upper lakes are surrounded by thick forests and are connected by numerous waterfalls, while the lower lakes are smaller, shallower and the vegetation is not so lush. Having passed over the Sastavci waterfall on the lower lakes, the lake waters flow into the River Korana,