northeastern segment of the Central Alps along the German-Austrian border. The mountains extend east-northeastward for 70 miles (110 km) from the Lechtaler Alps to the bend of the Inn River near Kufstein, Austria. Zugspitze (9,718 feet 【2,962 m】) is the highest point in the range and in Germany. Subranges include the Wetterstein Range, Karwendel Range, and Nord Chain; the Austrian portion is also known as the North Tirol Limestone Alps. To the south the range's steep wall overlooks the Inn River valley, whereas to the north its gentle slopes allow the grazing of cattle. The mountains hold lignite mines and petroleum deposits and are crossed at Scharnitz Pass (3,133 feet 【955 m】) by road and railway and at Achen Pass (3,087 feet 【941 m】) by road. Tourism and winter sports are the region's main activities. A large national park preserves the original Alpine landscape, plants, and animals from the steady encroachment of urbanization.