The Seedamm is an artificial causeway and bridge crossing the narrowest part of Lake Zurich between Rapperswil and Pfäffikon. It separates the Obersee (upper lake) from the rest of the lake and is traversed by a railway line and double-lane road. When crossing the Seedamm, Switzerland's longest modern timber-built bridge also comes into view. This footbridge extends over 841 metres, stands on 233 pillars and is a part of the Camino de Santiago, the legendary St. James's Way.