Sion is one of the most important prehistoric sites in Europe. The alluvial fan of the river Sionne, the rocky slopes above the river and, to a lesser extent, Valeria and Tourbillon hills have been settled nearly continuousl… See more

After the 2017 merger Sion had an area of 34.86 km (13.46 sq mi).
Before the merger Sion had an area (as of the September 2004 survey) of 29.69 square kilometers (11.46 sq mi). Of this area, abou… See more

The blazon of the municipal coat of arms is Per fess Argent two Mullets of Five Gules and Gules. See more