Blumberg is a municipality situated in the Schwarzwald-Baar region of Baden-Württemberg, Germany. Nineteen kilometres south of Donaueschingen, it lies between the southern edge of the Schwarzwald, the Black Forest, the border with Switzerland’s Canton of Schaffhausen, and Lake Constance.

The Wutach is a river, 91 kilometres long, in the southeastern part of the Black Forest in the German state of Baden-Württemberg. It is a right-hand tributary of the Rhine. In its lower reaches it flows for about 6 kilometres along the border with the canton of Schaffhausen, Switzerland.