Sion (German Sitten), capital of Valais, occupies the site of the Roman town of Sedunum and has been the see of a bishop since the sixth century. It is now an important market town for fruit and vegetables of the fertile Rhône valley, with many features of interest. The old town is built on the
detrital fan of the river Sionne, dominated by two picturesque castle-crowned crags. Here the river Borgne, coming from the Val d'Hérens to the south, flows into the Rhône, carrying down boulders and scree which the Rhône has thrust against its northern bank.
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