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The geological origin of Lake Como and Lugano, like many Italian subalpine lakes, is glacial. During the quaternary era the whole basin was covered by a large glacier which exceeded the branches of Como and Lecco. The lake was formed in the cavity excavated by the glacier, where the slow transition is evidenced by the rocks that still bear signs of erosion and numerous boulders present mainly on the heights of the area between the two branches. Lake Lugano was created by a side branch of the glacier that formed the Lario: digging in the valley behind Menaggio has reached Porlezza, where the little lake of Piano was once one with the Ceresio. In later times, the deposits of the rivers have filled the plain and divided the two lakes. « BACK

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See also:   Characteristics lake Lugano   Climate lake Lugano   Origin of the Lake Lugano