Black Forest

German  Schwarzwald,   mountain region, Baden-Württemberg Land (state), southwestern Germany, source of the Danube and Neckar rivers. It occupies an area of 2,320 sq mi (6,009 sq km) and extends toward the northeast for about 100 mi (160 km) from Säckingen on the Upper Rhine River (at the Swiss border) to Durlach (east of Karlsruhe). Its width varies from 10 to 25 mi. Structurally and topographically it forms the counterpart