Tuc de Saublanca, Mountain peak between Bossòst, Spain and Bagnères-de-Luchon, France.

Tuc de Saublanca is a 1,952-metre mountain standing on the border between Bossòst, in the Vall d'Aran (Catalonia, Spain), and Bagnères-de-Luchon in France. The summit marks the state line along the Pyrenean crest, with the Spanish slope falling towards the Aran valley and the French side towards the Luchonnais.

The summit lies on the border between Bossòst, in the Vall d'Aran (Catalonia), and Bagnères-de-Luchon in France, at 1,952 metres. The sources record no historical events, so the peak's history is that of the state boundary line drawn along the Pyrenean crest between the two municipalities.

The summit lies on the border between Bossòst, in the Vall d'Aran (Catalonia), and Bagnères-de-Luchon in France. Its name is Gascon Occitan: "tuc" designates a rounded Pyrenean peak, and "saublanca" refers to the whitish colour of the ground. The summit marks the watershed between the two states.

Spring and autumn offer the best hiking conditions for reaching the summit. Multiple marked trails depart from both Bossòst on the Spanish side and Bagnères-de-Luchon on the French side, giving you choices depending on your pace and available time.

The 1,952-metre summit lies on the border itself: the municipal limits of Bossòst in the Vall d'Aran and Bagnères-de-Luchon in France meet at the top, so a walker can stand with one foot in each country. The name Saublanca refers to the white rock of the upper slopes.