Erosion caused the mountain to collapse and the vast, pale yellow and reddish rock basin to form, which becomes bigger every year. From the Grabenrad or the Illhorn (2,716 m) there are "fear inspiring" yet stunning views down into the Rhone valley.
Lake Maggiore extends from the Italian-speaking part of Switzerland far into the Italian regions of Piedmont and Lombardy. Thanks to its mild climate, there is lush, Mediterranean vegetation along its shores. In the hinterland is a wild and romantic mountain landscape with breathtaking views.
Lake Lugano is at the southernmost tip of the Tessin, the holiday region south of the ridge of the Alps, and it reaches its arms out into Italy. Thanks to the mild Mediterranean climate, there are even citrus fruit trees growing here, and visitors can sunbathe under palm trees.