Gauja

The Gauja River is a river in the Vidzeme region of Latvia. It is the only large river of Latvia that begins and ends its flow in Latvia. Its length is 460 km, of which 93.5 km are in Gauja National Park. In this part, the Gauja River flows through the Gauja Valley, which is between 1 and 2.5 km wide, and the maximum depth near Sigulda is 85 m. Thus, the Gauja is the longest river of Latvia if onl... (Wikipedia)