an arrondissement of the department of the Upper Pyrenees, in France. It is 484 square miles in extent, is divided into eleven cantons, and these into 197 communes, containing, in 1836, 110,542 inhabitants. The capital is the city of the same name, which is that also of the department. It is situated on a fine plain on the left bank of the Adour, is well built, with good paved streets, has a cathedral and two churches, a theatre, a hospital, and a fine market-place. The inhabitants amounted in 1836 to 12,630, who are chiefly employed in making hardware and leather. They have also a considerable trade with Spain. The prospects from the bridge towards the Pyrenees are very fine. It was the seat of the war during the duke of Wellington's campaign in France. Long. 0° 1° 32'. W. Lat. 43° 14'. 2°. N.