The Dolomites are a section of the Alps. They are located to 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 valley (Pieve di Cadore) in the east. The northern and southern borders are defined by the Pustertal (valley of the Rienz) and the Valsugana.
The region is commonly divided into the Western Dolomites and the Eastern Dolomites separated by the line Badia valley (ger. Gadertal) - Campolongo pass - Cordevole valley (Agordino). The name Dolomites is derived from the famous French mineralogist Deodat de Dolomieu (1750 -1801) who was the first to describe the rock Dolomite which is responsible for the characteristic shapes of these great mountains.