Aste-Béon is located in the heart of the Ossau Valley some 33 km south-east of Oloron-Sainte-Marie and 7 km north of Laruns. Access to the commune is by road D240 from Castet in the north passing south down the valley in the west of the commune through the village and continuing to Béost in the south. The D290 connects the village of Béon in the north-east to the D934 road which runs from north to south parallel to the commune's western border. Most of the commune is rugged mountains with substantial forests except for a narrow strip down the western side of the commune in the Ossau Valley where there is farmland.