The Dolomites (Italian: Dolomiti [doloˈmiːti]) also known as the Dolomite Mountains, Dolomite Alps or Dolomitic Alps, are a mountain range in northeastern Italy. They form part of the Southern Limestone Alps and extend from the River Adige in the west to the Piave Valley (Pieve di Cadore) in the east. The northern and southern borders are defined by the Puster Valley and the Sugana Valley (Italian: Valsugana). The Dolomites are in the regions of Veneto, Trentino-Alto Adige/Südtirol and Friuli Venezia Giulia, covering an area shared between the provinces of Belluno, Vicenza, Verona, Trentino, South Tyrol, Udine and Pordenone.
Other mountain groups of similar geological structure are spread along the River Piave to the east—Dolomiti d'Oltrepiave; and far away over the Adige River to the west—Dolomiti di Brenta (Western Dolomites). A smaller group is called Piccole Dolomiti (Little Dolomites), between the provinces of Trentino, Verona and Vicenza.
The Dolomiti Bellunesi National Park and many other regional parks are in the Dolomites. In August 2009, the Dolomites were declared a UNESCO World Heritage Site. The Adamello-Brenta UNESCO Global Geopark is also in the Dolomites.