 Located in the French Pyrénées (Midi-Pyrénées region, Hautes-Pyrénées department, near Saint-Lary-Soulan and Barèges in the Néouvielle massif), the reserve lies to the east of the Pyrenees National Park.It lies in the municipal territories of Vielle-Aure (enclave), Saint-Lary-Soulan (enclave) and Aragnouet.It is bordered to the west by the Néouvielle massif, to the south by the Cap-de-Long and Orédon lakes, to the east by the lac de l'Oule and to the north by the col de Barèges.