the confluence of the Nottoway River and the Blackwater River, at the Virginia-North Carolina border, is the beginning of the Chowan River
Source: US Geological Survey (USGS), Streamer
The dark color of the Blackwater River reflects the high percentage of tannins and organic material dissolved in the river. There is little light-colored sandy sediment suspended in the water, where it flows slowly across the Coastal Plain. Similar to the blackest large blackwater river in the world, a tributary of the Congo River called the Ruki River, the water in the Blackwater River is essentially "swamp tea."1
the Chowan, Meherrin, Nottoway and Blackwater rivers flow into Albemarle Sound
Source: Wikpedia, Blackwater River (Virginia)