The Danube is the most important river running into the Black Sea. It is the second largest European river, which flows over 2,857 kilometres from its source in the Black Forest of Germany to the Black Sea. The Danube river basin can be divided into three sub-regions: the upper, the middle and the lower basin including the Danube Delta. The Upper Basin extends from the source in Germany to Bratislava in the Slovak Republic. The Middle Basin is the largest part and comprises the section from Bratislava to the dam between Republic of Serbia/Romania. The Romanian-Bulgarian lowlands and its upland plateaux and mountains form the Lower Basin of the river. Finally, the division of the river into three main branches creates the Danube delta, covering an area of about 6,000 km2. Photos shown here are taken near Cortanovci and Belgrade, Serbia.