Gauja (Estonian: Koiva River) is the longest river in Latvia, which flows only through the territory of Latvia. Meditate the border wall with Estonia. Length — 452 km, fall — 234 m. Gauja starts at Vidzeme Highland, but there are different opinions on the exact source: either in the Old Town, in the Mount of Elka or from Lake Alauksta. Flows into the Gulf of the Baltic Sea near Carnikov. Wikipedia
