Derborence Lake was created as a result of a massive landslide near Sion in the 18th century. The eponymous valley is a nature reserve with a pristine beauty that fascinates geologists, botanists and nature lovers alike.
A calm lake lies near the Oberalp Pass. This lake's water flows clear and fresh into the valley. The Tomasee (Lake Toma) is considered to be the source of the Rhine. And it is only here that the river that flows through four countries can still be crossed with a single step.
A narrow gorge, only penetrated by a few rays of sunshine at mid-day, a grotto where health seekers bathed, and arguably the most famous natural scientist as first spa physician - this is Bad Pfäfers. Today the Tamina Gorge (approx. 15 minutes from Bad Ragaz) is accessible in a more comfortable way than in the ancient past.
The idyllic hilly countryside around the lake, the medieval castle of Hallwyl with its heritage exhibitions, and the romantic boat trips round the lake make Lake Hallwil and the nearby Seetal valley a small but popular tourist area.