Cinematic 4K 60 fps. A river is a natural flowing watercourse, freshwater flowing towards an water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. Turquoise lowland geography topography floodplain flood plain run burn beck nature drainage basin alluvial alluvium large big slow flow winter spring symmetrical and flat aerial potamic fluvial drone fly nile wide riverbed amazon yangtze floods mississippi missouri field fields volga brown background landscape view nature natural bright true simple standard road way highway bridge mekong loire oder warta aras brazos vltava ottawa vistula tagus UHD 3840X2160.