Helgoland lays almost 70 km away from the coast in the German Bay and belongs with its round about 1.650 inhabitants to the circle Pinneberg in the State of Schleswig-Holstein. In 1720 the natural connection between the mainisle and dune was destroyed by a storm tide, so that today the isle consists of the red Rock with steeply coast which rises up 61 m high out of the sea and a small neighbour island, the bathdune. The mainisle has a size of almost 1,0 km², the neighbourisle bathdune a size of 0,7 km². "Island-architecturally" very interesting is that Helgoland is not on one contour: It´s parted in upper, central and lower country. So on Helgoland there is "Up" and "down" but the natural conditions make it impossible to furnish a regular transport service with bus or streetcar. As unusual public transportation method there is an elevator connecting the lower country with the upper country. Helgoland is a nature monument with an extremely interesting geological history. The underground  of the southern North Sea usually consists of soft material, for example sand or mud exists, and so the "Helgoländer Rock" has a privileged position. The coloured sandstone represents a unique settlement underground for a singular flora and fauna, which occures mainly around the headisland, such as shelly limestone and chalk around the dune.