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The Aran Valley belongs politically to Spain but it lies on the northern side of the Pyrenees; geographically we could see it belongs to France. In fact this valley is crossed by the Garonne, one of the most important rivers in France, that flows into the Atlantic in Bordeux.
Wikipedia:
Aranese language is the standardized form of the Gascon variety of the Occitan language. The name Val d'Aran is Aranese. "Val d'Aran" itself is a pleonasm, as it means Valley of the Valley (val in Gascon and aran from Basque haran), a combination that reflects its unique geography. Aranese has been regularly taught at school since 1984. Like several other minority languages in Europe that recently faced decline, Aranese is experiencing a renaissance.
This might be true but my impression was that the authorities of Barcelona try to impose the use of the Catalan.