Kiev's River is the DNIEPER (7 letters) and Dnepr (5 letters). The DNIEPER is a major river in Eastern Europe, originating in Russia and flowing through Ukraine and Belarus before emptying into the Black Sea. It is the fourth longest river in Europe and has been an important trade route since ancient times. The Dnepr is a tributary of the DNIEPER, originating in Ukraine and flowing through Russia before joining the DNIEPER near Kiev. Both rivers are important to the region, providing water for drinking, irrigation, and transportation.