Located in northeastern Germany on the River Spree, it is the center of the Berlin-Brandenburg Metropolitan Region, which has 6 million residents from over 180 nations. Due to its location in the European Plains, Berlin is influenced by a temperate seasonal climate. Around one third of the city's area is composed of forests, parks, gardens, rivers and lakes. Berlin is situated in northeastern Germany, approximately 60 km (37 mi) west of the Polish border, in an area of low-lying marshy woodlands with a mainly flat topography, part of the vast Northern European Plain which stretches all the way from northern France to western Russia. The Berlin�Warsaw Urstromtal (ice age glacial valley), between the low Barnim Plateau to the north and the Teltow Plateau to the south, was formed by meltwater flowing from ice sheets at the end of the last Weichselian glaciation. The Spree follows this valley now. In Spandau, Berlin's westernmost borough, the Spree empties into the river Havel, which flows from north to south through western Berlin. The course of the Havel is more like a chain of lakes, the largest being the Tegeler See and Gro�er Wannsee. A series of lakes also feeds into the upper Spree, which flows through the Gro�er M�ggelsee in eastern Berlin.
Substantial parts of present-day Berlin extend onto the low plateaus on both sides of the Spree Valley. Large parts of the boroughs Reinickendorf and Pankow lie on the Barnim Plateau, while most of the boroughs Charlottenburg-Wilmersdorf, Steglitz-Zehlendorf, Tempelhof-Sch�neberg, and Neuk�lln lie on the Teltow Plateau.
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 M�ggelberge in the city's outskirts, and in the centre the Kreuzberg. While the latter measures 66 m (217 ft) above sea level, the former have both an elevation of about 115 m (377 ft). The
