15 kilometres of meditative hiking pleasure and one of Switzerland's most beautiful "water trails" run between Soubey and St-Ursanne.
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.
A multifaceted hiking tour: It begins in the heart of Solothurn and takes you through outlying areas to the romantic wilderness of a canyon blessed with a chapel and hermitage, and then on a gentle trail along the foot of the Jurassic Mountains to your destination, Grenchen, the watch city.
The "bisses" are traditional irrigation channels which were built several centuries ago in order to bring precious glacier water to the cultivated land around Crans-Montana.