It connects Nesslau-Neu St. Johann in Toggenburg in St. Gallen and Urnäsch in Appenzell Ausserrhoden. It is named after the Schwägalp peak (el. 1,360 m or 4,462 ft) on the north face of Säntis (el. 2,502 m or 8,209 ft), which is the starting point of the aerial tramway to the top of Säntis. It was built in 1935.
The pass road has a maximum grade of 12 percent (12%).