The Dolomites are a section of the Alps. They are located in equal parts in the provinces of South Tyrol, Belluno and Trentino (all in northern Italy) and extend from the Adige river in the west to the Pieve valleyin the east. The northern and southern borders are defined by the Pustertal and the Valsugana. The region is commonly divided into the Western and Eastern Dolomites, separated by a line following the Badia valley - Campolongo pass - Cordevole valley axis. The range includes more than forty glaciers.