Lake Urdensee is situated on 2'249 m asl in a side valley of the middle Schanfigg between the municipalities of Arosa and Vaz/Obervaz, as well as the alp region Urder Augstberg. It is surrounded by the mountains Plattenhorn, Hörnli, Hörnligrat, Tschirpen, Parpaner Weisshorn and Parpaner Schwarzhorn.
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The Rhine rises in the Grisons Alps, the Vorderrhein near Lake Toma, Oberalppass in the Surselva and the Hinterrhein near the Rheinwaldhorn in the Hinterrhein/Viamala region. At Reichenau-Tamins, the Vorderrhein and Hinterrhein join to form the Rhine, which then flows past the city of Chur through the Graubünden and St. Gallen Rhine valleys into Lake Constance and on to the North Sea.
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The Pradner mineral spring provides an almost forgotten remedy: the so-called "Natron Säuerling". The mineral water that emerges is said to be particularly appetising and healthy.
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