English: Grynau (Grinau or Schloss Grynau) is a castle tower, situated on the Linth canal in the Swiss municipality of Tuggen in the Canton of Schwyz on the eastern slope of the Buechberg hill. It was built by the House of Rapperswil in the early 13th century AD when the tower was situated on the Tuggenersee lake shore.
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== {{int:filedesc}} == {{Information |Description= {{en|'''Grynau''' (''Grinau'' or ''Schloss Grynau'') is a castle tower, situated on the Linth canal in the Swiss municipality of Tuggen in the Canton of Schwyz...