In the National Park unique and distinctive feature are the natural factors, particularly the influences of the vegetation in the process of sedimentation. While passing the vegetation, barriers are being created by foaming water. These naturally created barriers decelerate and dam the waters, thus forming lakes. At Plitvice, this constant interplay between water, air, rock and vegetation can easily be observed. The foaming water creates ever growing and impressive waterfalls. The thresholds grown up above the water level, create cataracts. On the one hand, chalk tufa is being washed away partly. On the other hand, new sediments are continuously being formed. Thus, new waterfalls are being formed while others run dry. Nature itself is continuously adapting to these new conditions. As a whole, the complex of lakes represents a very sensitive and labile ecosystem.
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