Daugava

The Daugava () or Western Dvina is a river rising in the Valdai Hills, Russia, flowing through Russia, Belarus, and Latvia and into the Gulf of Riga. The total length of the river is : in Russia, in Belarus, and in Latvia.
Within Latvia it flows through Latgale, Zemgale, Vidzeme and Riga, before flowing into the Gulf of Riga.