St. Gallen–Thurgau border

Hörnli mountain is located on the territory of the community of Fischenthal, in the Zürcher Oberland, in the eastern part of canton of Zurich, in Switzerland. It is high.

thumb|left|upright|On the summit The Hohgrat, also known as Grat, is a mountain located on the border between the Swiss cantons of Thurgau (municipality of Fischingen) and St. Gallen (municipality of Mosnang, Toggenburg). Reaching a height of above sea level, it is the highest point of the canton of Thurgau.