a fortified border town of France, department of Moselle, near the Chiers, a tributary of the Meuse, 33 miles N.N.W. of Metz, and about a mile distant from the Belgian frontier. It is divided into an upper and lower town. The former is situate on an elevation once occupied by a strong castle, which was destroyed, and replaced in the time of Louis XIV., by a tower fortified by Vauban. The latter, which contains most of the manufactories, lies underneath the southern escarpment of the upper town. The chief public buildings, including the town-hall, the principal churches, and an hospital, belong to the upper town; while the manufactures of calico, Delft ware, and porcelain, are carried on in the lower town. Longwy has sustained many sieges. In 1792 it was taken by the Prussians under the Duke of Brunswick, and again in 1815 by the allies under the Prince of Hesse Homburg, after a gallant resistance. Pop. 3374.