Drainage basin

Drainage basin
In addition to the bordering countries (see above), the drainage basin includes parts of nine more countries: Bosnia and Herzegovina (4.6% of the basin area), the Czech Republic (2.9%), Slovenia (2.0%), Montenegro (0.9%), Switzerland (0.2%), Italy (<0.1%), Poland (<0.1%), North Macedonia (<0.1%) and Albania (<0.1%).[14] The total drainage basin is 801,463 km2 (309,447 sq mi) in area and is home to 83 million people.[15][16][17] The highest point of the drainage basin is the summit of Piz Bernina at the Italy–Switzerland border, at 4,049 metres (13,284 ft).[18] The Danube River Basin is divided into three main parts, separated by "gates" where the river is forced to cut through mountainous sections:[17] Upper Basin, from the headwaters to the Devín Gate. Middle Basin, usually called the Pannonian basin or Carpathian Basin, between the Devín Gate and the Iron Gates. It includes the Hungarian plains Kisalföld and Alföld. Lower Basin, from the Iron Gates to the river mouth, including the Danube Delta.