In its current form, the park was created on January 1, 2006 by the merger of the Harz National Park in Lower Saxony, established in 1994, and the Upper Harz National Park in Saxony-Anhalt, established in 1990. As the former inner German border ran through the Harz, large parts of the range were prohibited areas, that apart from the fortifications had remained completely unaffected for decades. Today the park covers parts of the districts of Goslar, Göttingen and Harz.