A river that is dark in color (due to tannins and other plant decay products) and tend to not carry much sediment; they are characteristic of having shallow banks and slower flowing water than brown water rivers.
The Blackwater River is a 31 mi (50 km) long riverHissom, Patricia. 2006. "Blackwater River." The West Virginia Encyclopedia.
The Blackwater River is a tributary of the Lamine River, about 55 miles (90 km) long, in west-central Missouri in the United States. Via the Lamine and Missouri Rivers, it is part of the watershed of the Mississippi River.