a town and spa of Germany, in Prussian Westphalia, pleasantly situated on the Aa and the railway SoestHoxter-Berlin. Pop. 2600. It has an Evangelical and a Roman Catholic church and some glass manufactures. It is celebrated for its saline-ferruginous springs, discovered in 766, and since 1779 largely frequented in summer. In the vicinity are the ruins of Iburg, a castle destroyed by Charlemagne in 775, and bestowed by him upon the bishopric of Paderborn.