The Plitvice Lakes ( Croatian: Plitvicka Jezera) are a national park in Croatia,, in the Plitvice Lakes municipality, near the border with Bosnia and Herzegovina.
The Plitvice Lakes lie in a basin of karstic rock, mainly dolomite and limestone, which has given rise to their most distinctive feature. The lakes are separated by natural dams of travertine, which is deposited by the action of moss, algae and bacteria. The encrusted plants and bacteria accumulate on top of each other, forming travertine barriers which grow at the rate of about 1 cm per year.
The lakes are renowned for their distinctive colours, ranging from azure to green, grey or blue. The colours change constantly depending on the quantity of minerals or organisms in the water and the angle of sunlight.
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