The Adour river is born, as Adour de Payolle, at the north side of the Arbizon mountain. In the Campan valley, that is formed by three smaller valleys corresponding to the sources of the three "Adours" ("Adour de Payolle", "Adour de Gripp" and the "Adour de Lesponne"), these small rivers meet at Campan (Arrondissement of Bagnères-de-Bigorre) to form the Adour river.