The Dennert Fir Tree ( also known as the Dennert' scher Tannenbaum, Dennert-Tafel or Dennert-Fichte) is a signboard that is used throughout the Harz mountains in Germany to provide information about mining and other points of interest in the area. The signboards mark locations, traces and monuments to mining, to the Upper Harz Water Regale, a medieval water management system, or even personalities in mining history in the Upper Harz mining area. They have since become used to document other notable sites within the Harz.