Boum, Mountain summit in Benasque and Haute-Garonne, Spain and France
Pic de Boum is a mountain summit at about 3000 meters elevation within the Perdiguero massif, marking the natural border between Spain and France. The peak rises above alpine meadows and rocky slopes that descend into valleys on both the Spanish and French sides.
The summit has served as a natural boundary marker between Aragon and Occitania since 1659, when the Pyrenean border was established between the two kingdoms. This dividing line has remained the frontier between the administrative areas ever since.
The mountain communities on both slopes share similar traditions of pastoralism and mountain living that transcend the border between them. People from the valleys still use seasonal grazing lands and maintain customs that connect them across the dividing ridge.
Several hiking routes approach the summit from the Benasque Valley on the Spanish side and from the French valleys, with good trail markings throughout. Sturdy footwear and preparation for changing weather at altitude are strongly recommended for any visit.
Near the summit, the Forau d'Aigualluts river disappears into an underground cave system before emerging several kilometers away. This hidden water route creates an unusual natural bridge between the two sides of the mountain.
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