 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.It includes the lakes of Aubert and Aumar.The reserve is in the lee of summits ranging from the pic de la Munia to the Arbizon massif and is generally exposed southwards, which induces a hotter and drier microclimate allowing a life limit extension.