 The villages in the upper part of the valley (Arbéost and Ferrières) belong to the Hautes-Pyrénées and have relationships with the Val d'Azun, on the other side of the mountain.On the other hand, the lower part of the valley, close to Pau, is Béarnese (Pyrénées-Atlantiques).The Ouzoum rises at "Cap d’Ouzom" ("head of Ouzom") at above sea level in the Litor Circus dominated by the Grand Gabizos at .