Plitvice Lakes National Park in Croatia, where the waters flowing over the limestone and chalk have, over thousands of years.
The 295-sq.-km forest reserve in central Croatia where the waters movement deposited travertine barriers resulting in natural dams, in turn creating a series of beautiful lakes, caves and waterfalls; this continues to occur today. The lush forests in the park are home to bears, wolves and many rare bird species. In 1979 it was added to the UNESCO World Heritage register.
World famous for its lakes arranged in cascades, 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 particularly sensitive travertine barriers are the result of an interplay between water, air and plants. The encrusted plants and bacteria accumulate on top of each other, forming travertine barriers which grow at the rate of about 1 cm (0.4 in) per year.
The lakes are renowned for their distinctive colors which span from azure to green, grey or blue; the colors are in constant flux depending on the quantity of minerals or organisms in the water and the angle of sunlight. The different climatic influences and the large difference in elevation natural to this protected area have spawned a multifaceted flora and fauna and is home to many endemic species, that prevailed at the lakes before the arrival of man still exist.