High Alps
As shown on the National Map of Switzerland, the Swiss-Austrian-Italian tripoint is north of Piz Lad, in the Engadin. The border follows the Inn River between Martina and Nauders and then runs west towards Samnaun. It cuts across the High Alps, connecting the peaks of Grübelekopf (), Bürkelkopf (), Greitspitz (), Piz Rots (), Fluchthorn (), Augstenberg (), Piz Buin () and Gross Seehorn (), roughly following the northern watershed of Engadin, and then to Isentällispitz () and Schesaplana (), along the northern watershed of Prättigau valley, meeting the southern tripoint of Switzerland, Austria and Liechtenstein at Naafkopf ().