Water in a stream, river or lake may look clean, but it can still be filled with bacteria, viruses, and parasites that can result in waterborne diseases, such as cryptosporidiosis or giardiasis. It is essential that you purify natural water.
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Tara River, EuropeAlso known as the Jewel of Europe, Tara flows through the Balkan nations of Montenegro and Bosnia-Herzegovina. One of the cleanest rivers in the world, it is a UNESCO protected river under the World's Natural Heritage and the World's Biosphere Reserve.
Sources of turbidity can include soil erosion, waste discharge, urban runoff, eroding stream banks, large numbers of bottom feeding fish, -- which can stir up sediment, excessive growth of algae, microorganisms and land development.