SCHWALBACH, or LANGENSCHWALBACH  , a favourite German health resort, in the Prussian province of Hesse-Nassau, pleasantly situated in a deep valley, near the junction of the Schwalbach with the Aar, 12 M . N.W. from Wiesbaden, on the railway Dotzheim-Dietz . Permanent population (1905) 2836 . Besides a large kursaal, the town has four churches, two Evangelical, a Roman Catholic and an English, a synagogue and several schools . There are eight springs, which are largely impregnated in varying proportions with iron and carbonic acid, and are used both for drinking and bathing . They are especially efficacious in feminine disorders, and the greater number of visitors (about 6000 annually) are ladies . The public grounds are prettily laid out and there are numerous fashionable hotels . See Frickhoffer, Die Eisenquellen zu Schwalbach (2nd ed., Schwalbach, 1888), and A . Genth, Geschichte des Kurortes Schwalbach (3rd ed., Wiesbaden, 1884) .