The borough of Spandau lies partly within the Berlin Glacial Valley and partly on the Nauen Plain, which stretches to the west of Berlin. The highest elevations in Berlin are the Teufelsberg and the Müggelberge in the city's outskirts, and the Kreuzberg is the highest elevation in the centre. While the latter measures above sea level, the former are both about above sea level. The Teufelsberg is actually an artificial hill composed of a pile of rubble from the ruins of World War II.