an arrondissement of the department of the Lower Pyrenees, in France, 616 square miles in extent, containing seven cantons, 157 communes, and 83,600 inhabitants. The capital is the city of the same name, situated on the Gave de Pau. It contains 1000 houses, and 7300 inhabitants, who are occupied in making flannels and other woollen goods, and in tanning leather. A great quantity of hams are cured here, and sold under the name of Bayonne hams. It has been rendered remarkable by a victory which the Duke of Wellington gained there over the French army. Long. 50° 50'. W. Lat. 43° 32'. N.