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«The hinge of the alpine anticlinal is located in the mid part of the Poschiavo valley, where the alpine chain culminated during its last corrugation phases.
The waters descended from the area of Pizzo Canciano and Piz Trevisina in a northerly direction. The ridge that leads from Pizzo Canciano towards the south east and Val Trevisina, which in its topmost part runs in a south westerly direction, is a witness to this ancient hydrography.
At a later stage erosion moved the watershed north by about thirty kilometres. The waters of the Poschiavo valley today flow into the Po, with the exception of those of the Orsera valley, which flow into the Danube. |
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Valposchiavo: to the left the Trevisina valley and to the right the Vartegna chain
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