It lies in a basin at the foot of the eastern slope of Mt. Leone deeply shaped by the glaciers, as witnessed by the rocks, the morainic detritus, the alpine lakes, and the big erratic boulders. Originally a natural alpine small lake, it was transformed into an artificial basin with a depth of 30m and a surface area of 4 km for the production of hydroelectric energy. Its name probably derives from lake "d'arvina", meaning "rovina" (ruin), referring to the surrounding smashed and detrital slope, then transformed into "divino" or "da vino".
Itinerary: the tour (about 2 hours and 30 minutes) is easy and for everyone. It leaves from the huts of Cianciavero (1,753m) covered with wonderful and regular roofs "in piode", follows the narrow road entering the gorge of the homonymous torrent, and continues uphill in the thin woodland from where you can enjoy the view of the "giants' potholes", deriving from millennia of river erosion. After the grassy clearing of Pian Cucco, a steep gully leads to the plateau below the Dam.