This lake lies at the south western entry of the province, and is also known as Lake of the Corlo. It is an artificial lake that took shape from the barrier on the river Cismon. It has a stretch of plain bank, with a shore of about 200 m at La Stua.
The lake, with its elongated and irregular shape, lies south east of Arsiè, as far as Rocca, a little hamlet that in 1954 had been almost completely flooded by the construction of the dam. Today there are a little group of houses and the church to testimony the existence of the old hamlet. Opposite Rocca there is a dirty road that crosses the wonderful creek in the varied sedimentary rocks and then a suspension bridge on steel ropes.
The lake is 2.450 square km, and it is at about 300 above sea-level.