Daugava

The Daugava or Western Dvina is a large river rising in the Valdai Hills of Russia that flows through Belarus and Latvia into the Gulf of Riga of the Baltic Sea. It rises close to the source of the Volga. It is 1,020 km in length, of which 352 km are in Latvia and 325 km are in Russia. It is a westward-flowing river, tracing out a great south-bending curve as it passes through northern Belarus.

Latvia's capital, Riga, bridges the river's estuary four times. Built on both riverbanks, the city centre is 15 kilometres from the river's mouth and is a significant port.

Source: Wikipedia