Gap is the prefecture of the department of Hautes-Alpes, in the region of Provence-Alpes-Côte d'Azur, Southeastern France. In 2019, the commune had a population of 40,631, making it the most populated city in Hautes-Alpes. At a height of 750 metres above sea level, to the south of the Écrins Massif, it is also France's highest prefecture.

Briançon is the sole subprefecture of the Hautes-Alpes department in the Provence-Alpes-Côte d'Azur region in Southeastern France. It is the highest city in France at an altitude of 1,326 metres, based on the national definition as a community containing more than 2,000 inhabitants. Its most recent population estimate is 11,084 for the commune.