Ros (Russian and Ukrainian: Рось, Ros’) is a river in Ukraine, 346 km in length, a right tributary of the Dnieper river. A watershed is a region of land where water drains downhill into a specified body of water, such as a river, lake, sea, ocean or wetland. ... The source of a river or stream may be a lake, a spring, or a collection of headwaters. ... In hydrology, the discharge of a river is the volume of water transported by it in a certain amount of time. ... A watershed is a region of land where water drains downhill into a specified body of water, such as a river, lake, sea, ocean or wetland. ... The Murray River in Australia. ... The Dnieper River (also: Dnepr, Dniapro, or Dnipro) is a river (2,290 km length) which flows from Russia through Belarus and then Ukraine. ...

Some historians have suggested the possibility that the name of the Kievan Rus', the old East Slavic state, may have originated from the name of the Ros river, the theory referred to as the antinormantist theory of the origin of Rus'. Map of the the extent of Kievan Rus through the 11th century. ... The East Slavs are the ethnic group that evolved into the Russian, Ukrainian and Belarusian peoples. ... The origins of the Rus (Rus , Русь) are controversial. ...

Cities on the Ros'

• Bila Tserkva