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Lake Nembia, like the nearby Lake Molveno, was formed following a post-glacial landslide that blocked the valley, preventing the flowing of water.
Originally it was fed by the underground waters coming from the nearby Lake Molveno, located 68 m higher and a little more than a kilometer away.

The small lake of Nembia is 400 meters long and 120 meters wide and is a shallow basin.

From 1952, in this area, great works were carried out for the construction of the Sarca River hydroelectric system. This changed the natural water system. The original pond was completely dried up. And its source, a branch of the underground emissary of Lake Molveno, was captured for the upgrading of the S. Massenza hydroelectric plant.

The imposing dam was built for the planned but never done raising of the level of Lake Molveno. In the following years, the parched depression of the lake was occupied by grasses and bushes. For many years the area was abandoned. In the summer of 1995 ENEL began an environmental recovery project. This led to the demolition of the dam and the reconstitution of Lake Nembia. The bottom was dug and compacted, thus ensuring a continuous supply of water through a new artificial tributary.

Subsequently the Environmental Restoration and Enhancement Service of the Autonomous Province of Trento re-naturalized the shores. In fact, he equipped the shores of the lake as a recreational area. Following the agreement between ENEL and WWF, the naturalistic oasis of Nembia was created. This educational path, about 3 km long, is an invitation to approach a re-naturalized territory after heavy human intervention.

The route is flat and takes about an hour and a half of a quiet walk. It is illustrated by descriptive panels that explore the main naturalistic and historical-cultural aspects of the territory.