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.

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.

[3] Still today, sheep and cattle rearing continues to maintain pastures as well as the balance between lawn, heath and pinewood.

The forests of the Néouvielle massif are arranged in thickets of (mountain pine), the remaining space consists of rhododendrons and lawn.

The vegetation hosts a wide array of fauna with many emblematic breeds like the alpine marmot, the heather cock, the red crossbill, the golden eagle, the griffon, the egyptian vulture, le red kite, the bearded vulture as well as endemical animals: Pyrenean desman, Pyrenean brook salamander and isard.