(Slav. Kladsko), a fortified town of Prussian Silesia, government of Breslau, and 52 miles S.S.W. of a town of that name. It stands in a narrow valley on the left bank of the Neisse, not far from the Austrian frontier. It is strongly walled, and is further defended by an old castle built on a high hill on one side, and by a regular modern fortress erected on a hill on the opposite side of the town. It has several Lutheran and Catholic churches, a gymnasium, asylum for destitute children, infirmary, a large barracks, and other military buildings. Its chief manufactures are linen, damask, broadcloth, leather, and hosiery. It surrendered to Frederic the Great in 1742, was retaken by the Austrians in 1759, and restored to Prussia at the peace of 1763. Pop. (1849) 8222, exclusive of the garrison, which amounted to 2342.