- a canton in SW Switzerland. 2,021 sq. mi. (5,235 sq. km). Capital: Sion.
- a canton of S Switzerland: includes the entire valley of the upper Rhône and the highest peaks in Switzerland; produces a quarter of Switzerland's hydroelectricity. Capital: Sion. Pop: 281 000 (2002 est). Area: 5231 sq km (2020 sq miles)
