The Smolensk Upland is divided between the drainage basins of the Volga (east) and the Dnieper (west). A number of big rivers have their sources in the upland. These include the Dnieper, the Desna, the Vazuza, and the Moskva.
References
^"Калужская область" (in Russian). АИС «Соотечественники». Retrieved 19 December 2017.