The river is shallow, with an average depth of 2.5 feet. That means even though the river is tannic, or colored dark by nutrients that leach out of leaves, its waters are a clear golden-brown against a shallow, sandy bed.
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A favorite destination for canoeists and kayakers, Blackwater River offers opportunities for a variety of outdoor recreation. The river is one of the purest sand-bottom rivers in the nation, making this park a popular place for swimming, fishing, camping, and paddling.
Blackwater rivers are black due to the tannic acid leached from fallen leaves of trees such as oaks that inhabit the wide floodplains along the river's edge. As the water rises and falls, it draws nutrients from decaying plant and animal matter, known as detritus.
The largest blackwater river in the world, the Rio Negro provides roughly 14% of the average annual discharge into the Amazon, second only to the Madeira. Its main tributary, the Rio Branco, is by contrast a whitewater river.
Winding through rural areas and conservation land, the river is considered one of the cleanest rivers in the nation. This wild and natural river draws attention from scientists studying the insect life on its unusual shifting sandy bottom.
Lake Jesup, FloridaAlligators can be very dangerous and Lake Jesup is the most alligator-infested lake in America. It's said there could be up to 13,000 gators in this lake or more.
–The Smith River is the wildest and cleanest river in the country outside of Alaska — indeed, it is one of the cleanest rivers in the world. — The Smith is the only major undammed river in California.
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.