The physical geography of Germany has four major sections. The mountainous highlands in the south, the pre-alpine lands, the low mountain range between the mountainous south and the flat north, and the flatlands in the north. Germany's highest peak is the Zugspitze which peak is nearly 10.000 feet (2962 m).  This mountain is located in the (Bavarian) Alps. Forests cover almost a third of the country' s total surface. The Rhine, which is located in the very West, is the longest river with a length of 820 miles, followed by the Elbe as the country's second-largest. Another important river is the Danube which rises in the Black Forest and stretches to the Black Sea. Lakes of note are the  Chiemsee, Bodensee and the Muritz lake. Germany's largest islands are Rügen and Usedom, both located at the northeastern Baltic coast.