The Signalhorn is a mountain of the Silvretta Alps, located on the border between Switzerland and Austria. It lies just east of the Silvretta Pass and is the tripoint between the regions of Prättigau and Engadin (in the Swiss canton of Graubünden) and Montafon (in the Austrian state of Vorarlberg). References External links Signalhorn on Hikr Mountains of the Alps Alpine three-thousanders Mountains of Vorarlberg Mountains of Graubünden Austria–Switzerland border International mountains of Europe Mountains of Switzerland