The 24,700 hectares of the Harz National Park cover about 10 per cent of the total area of the Harz. The park lies in the western part of the Harz (see Upper Harz) and stretches from Wernigerode and Ilsenburg in the north to Herzberg and Bad Lauterberg in the south. Near its perimeter the park terrain is about sea level (NN) in the north and NN in the south and climbs to NN at the summit of the Brocken.