The Kyffhäuser is a small Mittelgebirge located in the Kyffhäuserkreis district of Thuringia and the Mansfeld-Südharz district of Saxony-Anhalt, not far from the larger Harz range to the northwest. The range has a length of , from west to east, and a width of .: The highest point at the Kulpenberg, with the Kulpenburg TV tower, is located near the village of Steinthaleben in Thuringia. The range borders on the Hainleite hill chain and the fertile Goldene Aue basin in the south. Large portions are protected as a nature park.