Located at the foot of Piz Baduz at an altitude of 2345 metres, Lake Toma is considered to be the source of the River Rhine. A one-hour walk away from the Oberalp Pass in Graubünden, it is the only place where the river can be crossed in one stride. With a surface area of 2.5 hectares, it is also the start of a 1230 kilometre journey through four European countries to the North Sea.
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