From the southeast end of Lake Constance road 13 leads up the wide valley of the Rhine to the village of Heerbrugg, with an old castle, and Altstätten (457 m/1,499ft; pop. 10,000), an ancient town with attractive arcaded houses (Marktgasse), a parish church of 1794 and a Heimatmuseum (local museum) in Prestegg, an old burgher's house (restaurant)
Here a road goes off on the right and over the Stoss pass to Gais (Appenzell, St Gallen), and another road crosses the Ruppen pass, through beautiful scenery, to Trogen and St Gallen. The road continues through Oberriet and comes in 29km/18mi to Buchs.