The Bernese Mountains are one of the most charming regions. The Aare River has its source here. It is the longest river, the entire riverbed of which is within the borders of Switzerland. Every year, nearly 260 cubic kilometers of water flows down from the Alps. This is more than 5 times more than in Lake Constance. During the Ice Age, water from the melting Aare glacier carved out as many as seven deep gorges in the rock plateau. One of these gorges is now the bed of the Aare River. For some, this is a disturbing place: the gorge is considered the home of a legendary dragon.