Bad Frankenhausen (officially: Bad Frankenhausen/Kyffhäuser) is a spa town in the German state of Thuringia. It is located at the southern slope of the Kyffhäuser mountain range, on an artificial arm of the Wipper river, a tributary of the Unstrut. Because of the nearby Kyffhäuser monument dedicated to Emperor Frederick Barbarossa, it is nicknamed Barbarossastadt. The municipality includes the villages of Seehausen, Udersleben and (since 2007) Esperstedt.