Berlin is located in eastern Germany, about 70 kilometers (44 mi) west of the border with Poland. Berlin's landscape was shaped by ice sheets during the last ice age. The city center lies along the river Spree in the Berlin-Warsaw Urstromtal, formed by water flowing from melting ice sheets at the end of the last Ice Age. The Urstromtal lies between the low Barnim plateau to the north, and the Teltow plateau to the south. In Spandau, Berlin's westernmost borough, the Spree meets the river Havel, which flows from north to south through western Berlin.