Saint-Gaudens is a commune and a sub-prefecture of the Haute-Garonne department in southwestern France. Saint-Gaudens lies at an altitud…Saint-Gaudens is a commune and a sub-prefecture of the Haute-Garonne department in southwestern France. Saint-Gaudens lies at an altitude of 405 m on a ledge overlooking the valley of the Garonne. It faces the Pyrenees and is a natural crossroads for routes between the Atlantic and the Mediterranean and between Toulouse and the Val d'Aran in Catalonia. Saint-Gaudens station has rail connections to Toulouse, Bayonne, Pau and Tarbes.