The most common symptom of PKD is high blood pressure. Other symptoms are: 1  Pain in the back and side. 2  Blood in the urine. 3  Frequent kidney infections.he most common symptom of PKD is high blood pressure. Other symptoms are: 1  Pain in the back and side. 2  Blood in the urine. 3  Frequent kidney infections.
The longest river of Europe is the River Volga. It flows primarily in a southerly direction through Russia into the Caspian Sea. The second longest is the Danube, flows west to east before entering the Black Sea.
After the Volga River, the Danube River is the second largest river in Europe. The Danube River is 2900 km long with a drainage area of 817 000 km 2. The Danube Riverâs source lies in Central Europe, on the eastern slopes of Schwarzwald, at 678 m above sea level. The river flows into the Black Sea along the boundary between the Ukraine and Romania. In its lower reaches, the river is 1 to 2 km wide. The Danube forms an extensive swampy delta (4500 km 2) that is restricted by dams and natural beach ridges.