The Daugava, is a river rising in the Valdai Hills, flowing through Russia, Belarus, and Latvia and into the Gulf of Riga. The total length of the river is 1,020 km, of which 325 km are in Russia.
Wikipedia https://en.wikipedia.org/wiki/Daugava
Address 5316, Latvia
Coordinates 56°19'58.974" N 26°10'2.62" E