Disentis (German) or Mustér (Romansh), with its official name Disentis/Mustér is a municipality in the district of Surselva in the Swiss canton of Graubünden.The skiing and summer tourism resort high up in the Rhine valley is the site of one of the oldest Benedictine monasteries in Switzerland. The monastery dates back to 720, its huge actual complex dates from 1696 to 1712.