In addition to the bordering countries (see above), the drainage basin includes parts of nine more countries: Bosnia and Herzegovina (4.6%), 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%). The total drainage basin is in area and is home to 83 million people. The highest point of the drainage basin is the summit of Piz Bernina at the Italy-Switzerland border, at . The Danube River Basin is divided into three main parts, separated by gates where the river is forced to cut through mountainous sections: