The Oberalpstock or Piz Tgietschen is a mountain in the Glarus Alps between the cantons of Uri and Graubünden. Its massif separates the valleys of Maderanertal (Uri) and Surselva near Sedrun (Graubündnen). The Oberalpstock is the highest summit of the Glarus Alps west of the Tödi, and also the highest mountain in the canton of Uri east of the Reuss. See also List of mountains of Graubünden List of mountains of Uri List of most isolated mountains of Switzerland References Swisstopo maps External links Oberalpstock on Summitpost Mountains of Switzerland Mountains of the Alps Alpine three-thousanders Mountains of Graubünden Mountains of the canton of Uri Graubünden–Uri border Tujetsch