The Sihl is a river of Switzerland. It rises at Drusberg in the Canton of Schwyz. It passes through the Sihlsee near Einsiedeln, and then enters the Canton of Zurich, flowing through the Sihl valley (Sihltal) at the foot of the Albis, passing the Sihlwald, the largest remaining deciduous forest of the Swiss plateau, near Langnau am Albis. In Zurich the Sihl flows underneath Zürich Hauptbahnhof (parts of the station are actually built below the Sihl), before joining the Limmat.
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