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This article is unconnected to the various rivers named Blackwater: see Blackwater River (note capitalization)Blackwater rivers are rivers with waters colored like clear tea to coffee. Most major blackwater rivers are in the Amazon River system and the American South.
The term blackwater describes the appearance of the water of such rivers, which is a dark coffee color. This color results from the leaching of tannins from the decaying leaves of adjoining vegetation. Blackwater rivers are also characterized by striking water clarity; so clear that visibility regularly exceeds 30 feet (9 meters). However, after rainstorms blackwater rivers can lose their typical clarity and color while sediment runs off from the surrounding forest. Within a few hours to a few days, the normal conditions return.
Chemically, blackwater rivers are very low in dissolved minerals and often have no measurable water hardness. The very acidic, almost sterile water, with a pH between 3.5-6, keeps parasite and bacterial populations to a minimum. For this reason, blackwater rivers are considered some of the cleanest natural waters in the world, most often compared to "slightly contaminated distilled water." The water chemistry of blackwater also inhibits the proliferation of insect larvae, so the forests around blackwater rivers tend to have less floor-dwelling mosquitoes.
1 Blackwater rivers of the world:
1.1 Amazonia
- Apaporis River : A tributary of the Japura River .
- Negro RiverThe Negro ( Spanish: black) River the great northern tributary of the Amazon River and the largest blackwater river in the world, has its sources along the watershed between the Orinoco and the Amazon basins, and also connects with the Orinoco by way of t: By far the largest blackwater river in the world, one of the largest Amazonian tributaries.
- Tahuayo River
1.2 American South
- Black River , a tributary of the Pee Dee RiverThe Pee Dee River also known as the Great Pee Dee River is a river in South Carolina. It originates in North Carolina in the Appalachian Mountains, where its upper reaches are called the Yadkin River, and it is extensively dammed for flood control and hyd in NorthNorth Carolina is a southern state in the United States. North Carolina is one of the thirteen colonies that revolted against British rule in the American Revolution. It is bordered by South Carolina on the south, Georgia on the southwest, Tennessee on th and South CarolinaSouth Carolina ( In Detail) (Full size) State nickname: Palmetto State Other U. States Capital Columbia Largest City Columbia Governor Mark Sanford Area Total Land Water % water Ranked 40th 82,965 km² 78,051 km² 4,915 km² 6% Population Total ( 2000) Densi in the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in.
- Cape Fear RiverThe Cape Fear River is a 202 mi (325 km) long river in east central North Carolina in the United States. The longest river entirely within North Carolina, it flows into the Atlantic Ocean near Cape Fear, from which it takes its name. It is formed at Haywo: A large river in North CarolinaNorth Carolina is a southern state in the United States. North Carolina is one of the thirteen colonies that revolted against British rule in the American Revolution. It is bordered by South Carolina on the south, Georgia on the southwest, Tennessee on th in the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in flowing into the Atlantic Ocean.
- Cashie River : A river in North Carolina in the United States flowing into Albemarle Sound.
- Chowan River : A river in North Carolina in the United States flowing into Albemarle Sound.
- Edisto River: A large river in South Carolina in the United States flowing into the Atlantic Ocean.
- Great Coharie Creek : A river in North Carolina in the United States flowing into Black River .
- Lumber / Drowning Creek : A river in North and South Carolina in the United States.
- Suwannee River: A large river in southern Georgia and northern Florida in the United States flowing into the Gulf of Mexico.
- Upper Little River : A river in North Carolina in the United States flowing into the Cape Fear River.
- Waccamaw River: A river in North and South Carolina in the United States flowing into the Atlantic Ocean.
- White Oak River: A river in North Carolina in the United States flowing into the Atlantic Ocean.
