The Jungfrau-Aletsch-Bietschhorn region, located south of the city of Berne, is the most glaciated area in the Swiss Alps. The Alps were formed 20 to 40 million years ago, by uplift and compression. Nine peaks in the region are higher than 4.000 meters. The Aletsch glacier is the largest, longest and deepest in Europe. The northern part of the region, with the Eiger, Mönch and Jungfrau peaks, has a high natural scenic value, which has played an important role in European literature. In the Trümmelbach Gorge waterfalls drain the water from the glaciers.