The department is surrounded by the following French departments: Alpes-de-Haute-Provence, Drôme, Isère, and Savoie. Italy borders it on the east.
Hautes-Alpes is located in the Alps mountain range. The average elevations is over 1000 m, and the highest elevation is over 4000 m. The only three sizable towns are Gap, Briançon, and Embrun, which was the subprefecture until 1926.
The third highest commune in all of Europe is the village of Saint-Véran. Gap and Briançon are the highest prefecture and subprefecture in France.
Source : http://en.wikipedia.org/wiki/Hautes-Alpes