Stein is a municipality in the district of Rheinfelden in the canton of Aargau, Switzerland. The town lies across the Rhine River from Bad Säcking…Stein is a municipality in the district of Rheinfelden in the canton of Aargau, Switzerland. The town lies across the Rhine River from Bad Säckingen in the German state of Baden-Württemberg. Two bridges link the two city, one vehicular and the other, the Holzbrücke pedestrian bridge.